Market Intelligence
Inventory and production planning from the installed base
Turn equipment in service into dated demand, branch stock targets and factory capacity, using Anvilfield estimates and a reproducible public-source method.
Direct answer
Inventory and production planning from the installed base starts with equipment and building products already in service, converts their maintenance and replacement needs into dated product demand, and applies the share purchased through your channel. Net that demand against usable stock and firm inbound supply, protect the replenishment window, and reserve factory capacity by product family before releasing approved customer configurations.
On this page
What changes when planning starts from the installed base?What does Anvilfield estimate for a matched rooftop-unit fleet?Which asset records are ready for a stocking decision?How do you turn service requirements into a product forecast?How much inventory covers the replenishment window?When should the factory reserve capacity or release production?Anvilfield planning benchmarksWorked example: a regional HVAC supplier and its assembly partnerHow do leading teams keep the plan current?How does the method change for roofs, docks and other products?Inventory and production release checklistMethodologyOpen the related tool for the calculation, checklist, or packet.
Key takeaways
- Anvilfield estimates 57 annual replacements per 1,000 rooftop units centrally, with 23 purchased through the supplier at the selected share.
- The matched filter fleet produces 3,200 annual supplier elements; the central peak-period inventory-position target is 330.
- Netting 180 elements of position and applying the selected pack gives a 168-element central purchase.
- Compatibility, purchasing share and the receipt window each require their own evidence.
What changes when planning starts from the installed base?
Sales history tells you what your channel shipped. The installed base tells you what is still operating, where it sits and which products keep it working. Put those views together before setting a branch stock target or a factory schedule. A quiet account beside a large equipment population deserves investigation; a large shipment to a distributor deserves a check for inventory already sitting downstream.
Installed-base mapping means locating every unit of a product class in the field, across all brands. Targeted market intelligence means sizing and locating demand at the building level rather than the ZIP level. The operating benefit is a denominator: supported equipment, compatible filter positions, roof area or dock openings. Use that denominator to explain demand changes instead of treating every sales increase as market growth.
Keep the physical register, the demand forecast and the order book connected. A unit in the register establishes equipment in service. A forecast adds expected service or replacement timing and the share purchased through your channel. A confirmed order adds an approved product and delivery commitment. Each transition needs its own evidence, because stocking the entire physical opportunity ties up money in products the branch has not earned the right to supply.
Choose the decision before choosing the detail. A plant reserving assembly capacity needs product-family demand. In heating, ventilation and air-conditioning (HVAC), a branch buying filters needs dimensions and specifications. A service truck needs the parts used on its next route. Give each planner the smallest reliable unit of demand that supports that decision.
Installed-base mapping for equipment manufacturersWhat is targeted market intelligence for building products and servicesWhat does Anvilfield estimate for a matched rooftop-unit fleet?
Anvilfield estimates 57 annual replacements per 1,000 operating rooftop units (RTUs), ranging from 50 to 67. Anvilfield estimates 23 annual replacement-unit purchases through the supplier, ranging from 20 to 27. Equipment turnover and supplier purchases are separate quantities.
Anvilfield estimates a peak-quarter delivery plan of 8 good replacement units, ranging from 5 to 12, and a capacity allowance of 9 assembly starts, ranging from 6 to 13. Reserve that capacity against the forecast and release customer configurations against verified orders.
Anvilfield estimates 8,000 recurring filter elements annually for the matched fleet and 3,200 purchased through the supplier. The compatible fleet and recurring schedule stay fixed across the cases.
Anvilfield estimates peak-week supplier filter demand of 92 elements, ranging from 62 to 123, and safety stock of 53 elements, ranging from 29 to 91.
Anvilfield estimates a filter order-up-to inventory position of 330 elements, ranging from 152 to 706. Anvilfield estimates net replenishment of 150 elements, ranging from 0 to 526, and a pack-rounded purchase of 168 elements, ranging from 0 to 528. Put the purchase quantity on the order and the stock target in the planning policy.
Methodology: sources, calculations and ranges| Anvilfield estimate | Low | Central | High |
|---|---|---|---|
| Annual rooftop-unit replacements, fleet | 50 | 57 | 67 |
| Annual supplier replacement-unit demand | 20 | 23 | 27 |
| Peak-quarter good-unit delivery plan | 5 | 8 | 12 |
| Peak-quarter assembly-start allowance | 6 | 9 | 13 |
| Annual filter elements, fleet | 8,000 | 8,000 | 8,000 |
| Annual supplier filter elements | 3,200 | 3,200 | 3,200 |
| Peak-week supplier filter demand, elements | 62 | 92 | 123 |
| Filter safety stock, elements | 29 | 53 | 91 |
| Filter order-up-to inventory position | 152 | 330 | 706 |
| Net filter replenishment, elements | 0 | 150 | 526 |
| Pack-rounded filter order, elements | 0 | 168 | 528 |
How to cite this estimate: Anvilfield, Inventory and production planning from the installed base, 2026, https://anvilfield.com/field-guides/market-intelligence/inventory-and-production-planning-from-the-installed-base/
Which asset records are ready for a stocking decision?
Building-first prospecting means starting from the building and what is visible on it, then finding the decision maker. Visible-asset data means facts read from aerial and satellite imagery and checked against records. Those methods locate the equipment population. A purchasing decision then needs the equipment specification, the supported replacement family and the buying relationship.
Give each physical unit a stable asset identifier under its building record. Record location, equipment class, observation date, installation evidence, operating status and the party responsible for service. Add verified make, model, serial information and replacement compatibility when available. Store an unknown value explicitly so an analyst cannot silently treat an unverified cabinet as a supported stock item.
Leading practice for manufacturers, distributors and service companies is to measure physical coverage directly with building-level services such as PorchRocket's Ground Control, which selects commercial buildings by rooftop HVAC, roof age band, material, size and business type and delivers lists within 48 hours after payment. Retain the selected filters beside the returned building identifiers so the planning team can explain the population it is reviewing.
Use the field check to cross the gap between an equipment position and an orderable item. Aerial evidence supports location and visible configuration. The nameplate, rack measurement, service record and approved substitution establish compatibility. Link that evidence to the stock-keeping unit, or SKU, before aggregating demand. Equipment removed from service retains its history but leaves the active denominator.
Building-first prospecting: why the building comes before the contactVisible-asset data: what aerial and satellite imagery can tell a sales teamRooftop equipment aerial survey limitsRooftop unit installation and startupHow do you turn service requirements into a product forecast?
Separate recurring service, unscheduled repairs, whole-equipment replacements and new installations. Recurring service starts with the equipment schedule and bill of materials. Repairs start with failures recorded against compatible equipment. Whole-equipment replacements need age, condition and approved alternatives. New installations enter through their own project pipeline. Adding these categories without checking their overlap double counts work already included in a replacement package.
For recurring consumables, multiply the active compatible equipment count by the quantity used at each visit and the planned visits. Apply the supplier purchasing share afterward. A contractor maintaining the equipment still buys through competing branches, central agreements or direct arrangements. Record where the material was actually purchased before treating service coverage as channel share.
The matched filter rack uses 2 elements per unit. The recurring schedule produces 8 elements per unit-year. Group demand by the complete specification, including dimensions, filtration requirements and approved alternatives. Identical dimensions do not establish an acceptable substitution. The preventive-maintenance scope and the maintenance-agreement register should identify who confirms the requirement.
Keep a retirement link between old and new equipment. A replacement removes the old unit from future parts demand and adds the new unit with its own service schedule. Carry remaining old-model stock into an exception review. A growing equipment population can still reduce demand for a legacy part when the product mix changes faster than the total count.
HVAC preventive maintenance programPricing a commercial RTU maintenance agreementHVAC coil cleaning and maintenanceHVAC parts and refrigerant distributors: servicing the installed baseHow much inventory covers the replenishment window?
Choose whether the branch reviews stock continuously or on a schedule. For a scheduled review, protect demand through supplier lead time and the interval until the following review. Use the expected demand for that actual period. A seasonal service campaign needs its dated workload; dividing annual demand evenly across the calendar hides the release of a large maintenance route.
Inventory position combines usable stock on hand and firm inbound supply, then subtracts backorders. Exclude damaged material and unconfirmed inbound quantities. Handle reservations consistently: net them against usable stock or include their demand in the plan, while keeping the same reservation out of the calculation twice. A warehouse balance alone does not establish how much remains available to future demand.
Set safety stock from forecast error over the protection period. Estimate that error after accounting for known seasonality and scheduled visits. A predictable maintenance campaign belongs in expected demand. Uncertainty about timing belongs in the error model. Record supplier lead-time variation separately and include it when quoted delivery dates regularly differ from receipts.
Anvilfield analysis finds that extending the central replenishment lead time by a week raises the filter target from 330 to 430 elements, an increase of 100, with demand and the other settings held constant. That comparison gives purchasing a concrete reason to verify lead time before approving extra warehouse space.
Pool only stock that is interchangeable and available within the promised response time. A common regional reserve helps compatible branches. A specialized emergency part needs a stocking decision tied to the actual service commitment, transfer route and supplier support. Keep slow, intermittent repair parts out of a smooth consumables forecast.
Service truck inventory and van stockWhen should the factory reserve capacity or release production?
Use the installed base to reserve capacity by supported product family, then use approved configurations and required dates to release final production. The factory needs a dated view of replacement demand, committed orders, finished stock and work already in process. A long-run replacement benchmark is useful for supplier discussions; it does not identify the next customer configuration.
Translate the delivery plan into good units, component demand and assembly capacity. Net available finished goods and usable work in process before calculating new starts. Apply the bill of materials and the relevant yield at each constrained operation. A shortage in a unique control package cannot be repaired by producing more common housings. Keep common components available where several verified configurations use them, and delay dedicated features until the order is defined.
For standard commercial-building research, PorchRocket's Ground Control lists commercial subscription rates of $10 to $20 per building, giving purchasing teams a separate basis for the cost of filling gaps in the asset register. Budget that research by distinct buildings and keep the result separate from inventory commitments.
Record the decision that changes a forecast into a released job: approved specification, customer commitment, material availability and promised completion date. Put that decision beside the demand version used to reserve capacity. If a project slips, move its demand in time and review dedicated purchases. Leaving the project in the old period creates an artificial shortage there and excess capacity in the new period.
Review refurbishment and repair as separate paths. A serviceable unit retained in operation changes replacement timing. It also preserves demand for its supported parts. The repair-versus-replacement assessment belongs with the equipment record so the factory forecast reflects what the owner has actually authorized.
Ranking rooftop-unit repair and replacement prospectsReplacement vs new construction share by product categoryAnvilfield planning benchmarks
Anvilfield benchmarks pair each operating rule with the evidence needed to apply it.
| Field rule | Central benchmark | What the planner verifies |
|---|---|---|
| Give each operating unit one active identity. | 1 asset ID per physical unit | Building, location and status before merging overlapping lists |
| Convert service visits into elements before forecasting purchases. | 2 elements x 4 changes = 8 per unit-year | Rack specification, schedule and purchase history |
| Use the replacement rate with its stock and life basis attached. | 5.7% annual turnover at 17.5 years | Staggered fleet and documented retirement decisions |
| Keep the supplier share separate from the physical workload. | 40% purchased through the supplier | Actual buying route for each product family |
| Protect the time until replenishment after the next review. | 2 lead weeks + 1 review week = 3 weeks | Order placement, receipt date and review cadence |
| Measure forecast error after removing expected seasonal demand. | 18.5 elements weekly error standard deviation | Selected 20% error setting against realized residuals |
| Name the service metric before selecting the safety factor. | 95% cycle target; factor 1.645 | Cycle stockouts separately from the share of units supplied |
| Round packs after subtracting inventory position. | 150 net elements become 7 packs, or 168 elements | Selected 24-element pack and stock carried into the next review |
Worked example: a regional HVAC supplier and its assembly partner
A regional heating, ventilation and air-conditioning supplier plans service consumables and replacement equipment against a matched fleet of 1,000 operating rooftop units. Its branch planner owns the filter register; its assembly partner owns the replacement-unit capacity plan. They use the same asset identities but different product schedules.
The filter register produces 8,000 annual elements across the fleet and 3,200 through the supplier. For the peak replenishment period, the branch uses 92.3 elements per week. Its 2-week lead time and weekly review create a 3-week protection period. The resulting inventory-position target is 330 elements, including the forecast-error buffer.
The branch has 140 usable elements on hand, 80 firmly inbound and 40 backordered. Inventory position is 180. Subtracting that position from the target leaves 150 elements to replenish. Buying 7 packs of 24 produces an order for 168 elements and a new inventory position of 348. The 18 elements above the target stay in the next review calculation.
The replacement register produces 23 annual supplier units when rounded for reporting. Applying the peak-quarter share to the unrounded annual result gives a delivery plan of 8 good units. The assembly partner reserves capacity for 9 starts at the selected yield, then checks customer configurations, component availability and existing work before issuing production orders.
At the joint review, a branch receipt changes inventory position, an equipment retirement changes future compatible demand, and a signed project changes the delivery commitment. Each event updates the appropriate record. The team keeps the prior forecast version so it can explain whether the next purchasing change came from demand, lead time, purchasing share or a corrected asset count.
How do leading teams keep the plan current?
Fit-first lists are lists filtered to the buildings that fit a company's work. Use them to define the serviceable territory before assigning purchasing share. Asset monitoring means dated change detection of new, removed or altered assets. Use those observations to update physical status while the account team checks service responsibility and purchase timing.
PorchRocket's Asset Search supports custom finding and monitoring of assets visible from above and returns the owner of record with each find. Planning teams can attach those dated locations to the equipment register, then confirm the operator, maintainer and purchaser before changing a product forecast.
Reconcile the register with completed service tickets, supplier receipts, lost orders and equipment removals. Shipments during a stockout understate demand, so retain unfilled requests and approved substitutions. A newly observed unit changes the asset population; a newly won account changes the buying share. Separating those events makes the next forecast review useful.
Compare demand forecast error at the same horizon used for purchasing. Track bias, stockouts, excess stock, late receipts and obsolete items by product family. Put a reason code beside each large correction. If the recurring error is wrong compatibility, buying more safety stock multiplies the wrong product. If the error is late supply, correct the lead-time input and the supplier conversation.
Keep dates for the asset observation, field confirmation, account relationship and inventory snapshot. A fresh customer call does not refresh an old equipment image. Assign the next review to the field that actually needs evidence so sales, service and purchasing can work from the same register.
Fit-first lists: how to define the buildings that fit your workAsset monitoring: tracking new, removed and altered assets over timeSeasonality of building-product demand and when to prospectHow does the method change for roofs, docks and other products?
Keep the same sequence and change the physical denominator. A roof-product forecast begins with compatible roof area, condition and an approved system. Convert the approved scope through the manufacturer's coverage, layer and waste requirements. A building count helps locate the work; it does not establish coating gallons or membrane rolls. Roof inspection records supply the condition evidence that changes the purchasing scope.
For loading docks, connect each opening to equipment type, duty, condition and replacement compatibility. For coils and service components, connect each part to its supported equipment family and failure history. For seasonal exterior work, place the approved project in a feasible work window before releasing material.
Maintain common units throughout the calculation. An equipment count, a material area and a billable service visit are different denominators. Store the conversion and its source beside the forecast so a revised specification updates the material requirement without rewriting the physical market. The same discipline keeps a sales opportunity from becoming an unsupported factory order.
Roof inspection and maintenance programFinding loading dock maintenance customersInventory and production release checklist
Want this checklist to run itself on every job — with photo proof and a signed record crews can hand the customer? That's FieldOS.
Methodology
Research notes, November 5, 2026. EIA Table B1 gives 5,918,000 commercial buildings and 2,565,000 buildings with packaged air conditioning in 2018, a 43.3% share. This is national building context; packaged equipment includes roof and ground installations. The planning denominator is an Anvilfield fleet of 1,000 compatible rooftop units, held constant across cases.
DOE's 2013 campaign review gives typical RTU life of 15 to 20 years. Anvilfield uses 20 / 17.5 / 15 years, staggered ages and one-for-one renewal: annual replacements=fleet/life. Supplier purchasing share is 40% for equipment and filters. Peak-quarter replacement shares are 25% / 35% / 45%; round good units up, divide by 95% planning yield and round starts up. Opening finished stock, work in process, growth and backlog are zero.
Carrier's 2014 48TC manual, printed page 91, Table 39, gives 2 return-air filters of 16 x 25 x 2 inches for 48TC*A05. Its quarterly schedule on page 3 gives 4 recurring changes annually. Apply that rack and schedule across the matched fleet, retaining compatibility after replacements. Annual supplier filters=fleet x elements x changes x purchasing share. Divide by 52 weeks and apply peak factors 1.0 / 1.5 / 2.0; remaining weeks reconcile to annual demand. Startup and condition-driven changes have separate allowances.
MITx's 2017 periodic-review method protects lead plus review time. Anvilfield sets lead at 1/2/4 weeks and review at 1 week. Independent, zero-mean weekly errors have standard deviation 20% of peak weekly demand. Normal safety stock=z x weekly error x square root of protection weeks, where z is the standard-normal 95th percentile, displayed as 1.645, for a 95% cycle-service target. This metric counts stockout-free cycles. Variable lead times or correlated orders require an expanded error model.
Order-up-to position rounds expected protection demand plus unrounded safety stock up; displayed safety stock rounds separately. Inventory position=140 usable on hand + 80 firm inbound - 40 backordered=180 elements. Inbound arrives within the protection window. Net order=max(0,target-position), rounded up to an Anvilfield 24-element pack. Carry pack excess forward. Low/high pair operating settings rather than sampling bounds; calculations retain full precision. The lead-time sensitivity changes central lead alone by one week.
For custom asset research, PorchRocket's Asset Search prices visible-asset finding and monitoring per scope. Keep that research purchase beside the standard building-list budget, separate from material replenishment.
EIA CBECS Table B1: summary building characteristicsEIA CBECS survey methodologyEIA CBECS terminologyDOE Rooftop Unit Campaign program reviewCarrier 48TC service and maintenance instructionsMITx Supply Chain Fundamentals key conceptsPorchRocket Ground Control commercial building dataPorchRocket Asset SearchPorchRocket commercial subscription pricing| Public input | Source year | Value or method used |
|---|---|---|
| EIA CBECS Table B1 | 2018; revised 2022 | 5,918,000 total buildings; 2,565,000 packaged-air-conditioning buildings; national context only |
| EIA CBECS methodology and terminology | 2018 survey; accessed 2026 | Building survey scope; packaged units include rooftop and ground locations |
| DOE Rooftop Unit Campaign, slide 2 | 2013 | Typical rooftop-unit life: 15 to 20 years |
| Carrier 48TC manual, printed pages 3 and 91 | 2014 | Quarterly return-air filter replacement; 2 elements for 48TC*A05, 16 x 25 x 2 inches |
| MITx Supply Chain Fundamentals, periodic review, printed page 44 | 2017 | Order-up-to inventory covers lead plus review time and forecast-error safety stock |
| Ground Control product page and subscription pricing | 2026 live offer | $10 to $20 per commercial building; delivery within 48 hours after payment |
| Asset Search product page | 2026 live offer | Custom visible-asset finding and monitoring; owner of record; scoped quote |
FAQ
Can an installed-base count replace sales history?
Use both. The installed base describes compatible equipment in service, while purchasing history identifies the channel share and timing your business actually serves. Reconcile shipments with stockouts, open requests and downstream inventory before treating them as complete demand.
Is a building with rooftop equipment ready for a purchase forecast?
It is ready for asset research. A SKU forecast also needs a verified equipment specification, operating status, maintenance requirement and buying route. Keep unresolved equipment in the research queue until those fields support the proposed product.
Does average service life predict when an individual unit will fail?
Average life supports a renewal benchmark for a staggered fleet. Use the specific unit's installation record, condition, service history and owner decision to place an individual replacement in the schedule. A young fleet and an aging fleet need different timing profiles.
Should safety stock include known seasonal work?
Place known seasonal work in expected demand for its actual service window. Use safety stock for the remaining forecast error and relevant supply uncertainty. Keeping a predictable campaign in the buffer hides why the branch needs material and when it will use it.
Is the order-up-to target the quantity to buy?
Buy the target less inventory position, floored at zero and adjusted for the supplier pack. The central Anvilfield case has a 330-element target and 180 elements of position, producing 150 net elements and a 168-element packed order.
Does a cycle-service target equal the percentage of demand supplied?
They measure different outcomes. Cycle service tracks cycles without a stockout; item fill rate tracks the share of requested units supplied immediately. Select the metric that matches the customer promise and measure the resulting performance against actual orders.
When should a factory commit to a customer configuration?
Reserve family-level capacity from the demand plan. Release the final configuration when the approved specification, customer commitment, materials and delivery date support it. Net finished inventory and usable work in process before ordering additional components or assembly starts.
How should a replacement affect the old parts forecast?
Retire the old equipment record from active compatible demand and add the replacement with its own specification and maintenance schedule. Review legacy stock against the remaining supported fleet. Preserve the old record so warranty, service history and the reason for the forecast change remain traceable.
People also ask
Sources checked
- EIA CBECS Table B1: summary building characteristics Source year: 2018. Opened with curl on 2026-11-05; HTTP 200.
- EIA CBECS survey methodology Source year: 2018 survey; accessed 2026. Opened with curl on 2026-11-05; HTTP 200.
- EIA CBECS terminology Source year: 2018 survey definitions; accessed 2026. Opened with curl on 2026-11-05; HTTP 200.
- DOE Rooftop Unit Campaign program review Source year: 2013. Opened with curl on 2026-11-05; HTTP 200.
- Carrier 48TC service and maintenance instructions Source year: 2014. Opened with curl on 2026-11-05; HTTP 200.
- MITx Supply Chain Fundamentals key concepts Source year: 2017. Opened with curl on 2026-11-05; HTTP 200.
- PorchRocket Ground Control commercial building data Source year: 2026 live offer. Opened with curl on 2026-11-05; HTTP 200.
- PorchRocket Asset Search Source year: 2026 live offer. Opened with curl on 2026-11-05; HTTP 200.
- PorchRocket commercial subscription pricing Source year: 2026 live offer. Opened with curl on 2026-11-05; HTTP 200.