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How to Get Into Commercial HVAC Service (2026)

How residential HVAC shops add light-commercial service and PM contracts: payment terms, insurance, prevailing wage, pricing, bidding, and a 90-day plan.

A lot of residential shop owners look at light-commercial service and see the same thing: steady maintenance contracts, customers who don't shop every repair, and work that doesn't all land in the same three hot weeks. That's real. But commercial work runs on different rules. Customers pay later, want paperwork before you touch anything, expect you at 2 a.m. when the walk-in cooler is warm, and sometimes bring government wage rules with them.

This guide is for residential owners thinking about adding light-commercial service and preventive maintenance (PM). It covers how commercial is different, who to go after first, how to price PM contracts, how to bid and walk a building, what your techs need to know, and a 90-day plan to land your first accounts.

Any worked examples use made-up round numbers to show the math. They are not industry averages. Nothing here is legal, tax, insurance, or financial advice. Check with your insurance agent, accountant, and a local attorney before you sign commercial contracts.

Residential vs. commercial: what actually changes

1. You get paid later

Residential service usually gets paid at the job. Commercial customers usually pay on terms: you send an invoice, it goes into their accounts payable process, and a check or ACH shows up 30, 45, or 60 days later ("net-30," "net-60"). Some property management companies need the invoice approved by a site manager and a regional office before it's paid.

That gap is the biggest trap for a residential shop going commercial. Your techs still get paid every week or two. Parts still get bought now.

Worked example (made-up numbers): Say you add $20,000 a month of commercial work on net-45 terms. By the time the first payment shows up, you've done roughly a month and a half of that work — about $30,000 of labor and parts you've paid for but haven't collected. That money has to come from somewhere: your cash balance, a line of credit, or slower payments to your own suppliers. It doesn't go away as you grow, either. The more commercial work you add, the bigger that float gets.

What to do about it:

  • Price the float into the work. Waiting 45 days for money has a real cost.
  • Ask for terms that help you. Shorter terms, ACH or card payment, and progress billing on larger jobs. You won't always get them, but you won't get them if you don't ask.
  • Send clean invoices the same day. Most slow commercial payments come from invoices that are missing a PO number, a signed work order, or the site address the customer's AP team needs.
  • Track it. Use our Days Sales Outstanding calculator to see how long, on average, it takes you to collect. Watch that number as commercial grows.

For more on commercial invoicing, progress billing, AR aging, and lines of credit, see HVAC Cash Flow: How to Get Paid Faster.

2. Paperwork before you start: COIs and insurance requirements

Most commercial customers won't let you on site without a certificate of insurance (COI). Property managers often have a vendor onboarding packet that asks for some mix of:

  • A COI showing general liability, auto, and workers' comp coverage
  • Specific coverage limits they set (these vary a lot by customer — read the contract)
  • Being named as an additional insured on your policy
  • A waiver of subrogation
  • A W-9 and sometimes a vendor portal signup

Your current residential policy may not meet their limits or endorsements. Call your agent before you bid, not after you win. Ask what it costs to raise limits and add the endorsements commercial customers commonly ask for, and how fast they can turn around a COI for a new customer. See our HVAC contractor insurance guide for the coverage types and questions to ask.

Also read the indemnification and payment sections of any service agreement a customer hands you. Some vendor agreements shift a lot of risk onto the contractor. That's a conversation for your attorney, not something to sign on the tailgate.

3. Prevailing wage risk on public work

If you work on government-funded buildings — schools, municipal buildings, federal facilities, or projects paid for with federal money — the job may come with prevailing wage rules. These set minimum wage and fringe rates for each type of worker and add weekly paperwork. Getting this wrong can mean back wages and being barred from public work.

What the federal Davis-Bacon regulations (29 CFR Part 5) say, in plain words:

  • The labor standards clauses go into contracts over $2,000 for the construction, alteration, and/or repair (including painting and decorating) of a public building or public work, or a building or work financed in whole or in part from federal funds or federal agency guarantees. Source: eCFR, 29 CFR 5.5
  • Covered workers must be paid "not less often than once a week."
  • Contractors must submit certified payrolls weekly for each week covered work is performed. The DOL's Optional Form WH-347 can be used, or any other format.
  • Payrolls and basic records must be kept for at least 3 years after all work on the prime contract is completed.
  • Contractors found to have disregarded their obligations to workers can be made ineligible for federal and covered contracts for 3 years. Source: eCFR, 29 CFR Part 5

Recurring maintenance on federal contracts may fall under a different law, the Service Contract Act, instead. Its regulations list "maintenance and repair of all types of equipment" and "operation, maintenance, or logistic support of a Federal facility" among the types of service contracts found to be covered. Source: eCFR, 29 CFR 4.130

Which law applies depends on the contract. Also check whether your state or city has its own prevailing wage rules for public work. The practical advice for a shop just starting out: stay with private commercial customers first. If a public job comes up, ask the contracting officer or owner in writing whether prevailing wage applies, and get the wage determination before you price it.

4. Different equipment

Light-commercial service means a lot more rooftop work. Expect:

  • Packaged rooftop units (RTUs) — gas/electric and heat pump, often several per building, with economizers, curb adapters, and belt drives you don't see much in residential.
  • Split systems and ductless in small offices and retail, often similar to what your techs already know, but larger.
  • Refrigeration in restaurants — walk-in coolers and freezers, reach-ins, ice machines. This is its own skill set. Decide up front whether you're taking it on or referring it out.
  • Building controls — programmable and networked thermostats, and in larger buildings a building automation system. Know what you're walking into before you touch settings.
  • Roof access — ladders, hatches, and fall-protection rules. Your safety program needs to cover roof work before your techs go up.

5. After-hours expectations

A restaurant with a dead walk-in or an office with no cooling on a Monday morning expects a fast answer. Many commercial customers want an after-hours number that a real person answers and a stated response time. Before you promise one, decide:

  • Who's on call, how they're paid for it, and how often they rotate
  • What response time you can actually hit (and put it in writing — don't overpromise)
  • Your after-hours and emergency rates, written into the agreement

Also, a lot of commercial work has to happen when the business is closed — early mornings, evenings, or weekends. That changes your scheduling and your labor cost.

Who to target first

Start where the jobs look most like what you already do, the buildings are small, and the decision maker is easy to find.

  • Property managers. One relationship can open many buildings. They care about fast response, clean invoices, photos, and no surprises. Get onto their approved vendor list and be easy to work with.
  • Restaurants. Lots of equipment, lots of urgency, and they notice who shows up. Be honest about refrigeration: if you don't do it, partner with someone who does.
  • Small offices and retail. Often a handful of RTUs or splits, a single owner or office manager who decides, and PM that fits in a morning.
  • Churches and houses of worship. Often multiple systems, uneven use during the week, and facilities committees that value a trusted local vendor. Decisions can be slower — sometimes it takes a committee meeting.

Look at your existing residential customers too. Some of them own businesses, manage buildings, or sit on a church facilities committee. A warm introduction beats a cold call.

Harder places to start: large hospitals, big multi-tenant towers, chillers and central plants, and public bid work. Those can come later.

How to price PM contracts

A commercial PM contract is a promise to show up on a schedule and do a defined list of tasks. It's priced mostly on labor time per visit, not a flat "membership" price like residential.

Build it from the ground up:

  1. Count and list the equipment. Every unit: type, tonnage, age, location (ground, roof, above ceiling), filter sizes and counts, belts.
  2. Set the visit frequency. Quarterly and semi-annual are common. Some customers want monthly filter changes.
  3. Estimate time per unit per visit. Include travel, roof access, check-in with the site contact, and the paperwork, not just wrench time.
  4. Add materials. Filters, belts, coil cleaner, condensate treatment — whatever the contract includes.
  5. Apply your fully loaded labor rate and target margin. Use the same labor cost numbers you use everywhere else. If you don't know them yet, start with our job costing guide.
  6. Add the cost of waiting to get paid. Net-45 on a quarterly bill is money you've already spent.
  7. Decide what's included and what's not. Repairs are usually quoted separately. Say whether the contract includes a repair discount, priority response, or after-hours rates.

Worked example (made-up numbers): A small office has 4 RTUs on the roof, quarterly PM. You estimate 45 minutes per unit plus 45 minutes of travel, check-in, and paperwork — 3.75 hours per visit. At a made-up billing rate of $120/hour, that's $450 of labor per visit, plus $80 of filters and supplies, for $530 per visit, or $2,120 a year before any extras. Your real numbers will be different. The point is to build the price from time and materials, not guess at a round number.

Use our commercial maintenance contract pricing calculator to run this math with your own equipment count, visit frequency, and rates. For how plans are structured on the residential side, see our maintenance agreements guide.

Common pricing mistakes:

  • Pricing the first year low to "get in the door," then being stuck at that price
  • Forgetting roof access time, lift rental, or after-hours labor
  • Leaving the scope vague, so every filter change turns into an argument
  • No annual price increase clause

Bidding and walk-throughs

Never price a PM contract off an equipment list someone emails you. Walk the building.

On the walk-through:

  • Photograph every unit's data plate (model, serial, tonnage, refrigerant type)
  • Note filter sizes and counts, belt sizes, and condition
  • Check roof access: hatch, ladder, keys, who has to let you up
  • Note anything already broken or near the end of its life, and write it down before you own the contract
  • Ask the site contact what's been going wrong and who serviced it before
  • Ask about their hours, when you're allowed on site, and who signs work orders

In the proposal:

  • A clear equipment list (by unit, with location)
  • Visit frequency and the task checklist for each visit
  • What's included and what's quoted separately
  • Response times and after-hours rates, if you offer them
  • Payment terms, invoicing method, and where invoices go
  • Contract length, renewal, price adjustment, and how either side can cancel
  • Your COI and license information, if they asked for them

A deficiency list from the walk-through is often your first repair sale. Present it as a report, with photos, not a pitch.

Tech skills and training

Your best residential techs can learn light commercial, but don't send them up a roof on a three-phase RTU cold. Plan for:

  • EPA Section 608 certification that matches the equipment. Under 40 CFR 82.161, technicians who could be reasonably expected to open the refrigerant circuit must be certified: Type I for small appliances, Type II for medium-, high-, or very high-pressure appliances, Type III for low-pressure appliances, and Universal for all three. Apprentices are exempt only while "closely and continually supervised by a certified technician." Certified techs must keep a copy of their certificate at their place of business. Source: eCFR, 40 CFR 82.161 Most split and packaged commercial equipment is Type II. Low-pressure chillers are Type III. Universal covers everything, so it's the easy answer for anyone doing commercial work.
  • Three-phase electrical troubleshooting and safety
  • Economizers and ventilation — how they work and how to check them
  • Belt drives — tensioning, alignment, sheave wear
  • Gas-fired RTU heat sections and their safety controls
  • Commercial controls and whatever thermostats or automation systems your customers run
  • Roof and ladder safety, and fall protection
  • Customer check-in etiquette — sign in, find the site contact, leave a written report

Manufacturer and distributor training on the RTU brands common in your area is a good, usually low-cost place to start. Put your strongest tech on the first few commercial accounts and have them build the PM checklists the rest of the team will use.

A 90-day plan to land your first commercial accounts

Days 1–30: Get ready

Days 31–60: Get in front of buyers

Days 61–90: Deliver and learn

The goal of the first 90 days isn't a big commercial division. It's a few accounts you service well, real numbers on time and payment speed, and a price you know you can make money on.

Commercial readiness checklist

Commercial work, shop to shop

Whether commercial pays off depends on what has worked for shops your size, so bring your pricing, vendor packet, or property-manager payment questions to the Growth Room Discord.