HVAC Supply House Guide: The Six Major Chains, Contractor Pricing, and Credit Terms That Fund Your Business

Contractor pricing at a major HVAC supply house typically runs 5-15% under cash-and-carry walk-in rates, and the Net 30 terms behind those accounts quietly finance $50,000 to $200,000 of working capital for a mid-size shop at zero interest. Stack an OEM dealer relationship on top and a year-end volume rebate underneath and the same materials line can come in 12-25% cheaper than what the contractor down the road is paying.

Most HVAC owners never see that math. They pick the supply house closest to the shop, accept whatever counter price the parts guy quotes, pay the invoice when it shows up, and move on. The contractors compounding 25% a year work the supply chain like a second business. This is the 2026 playbook on the six chains that matter, how to qualify for the real pricing, and where the supply houses pull margin out of contractors who do not push back.

The six major HVAC supply chains in 2026

The North American HVAC distribution market is dominated by six players, each with a different geography, product mix, and pricing structure. Most contractors over $1M in revenue carry accounts at two or three of them and split orders by category.

Ferguson HVAC is the largest plumbing and HVAC distributor in the US by revenue. The HVAC side carries every major OEM (Carrier, Trane, Lennox, Goodman, Rheem, Mitsubishi) plus the deepest sheet metal, venting, and ductwork pricing of any chain. Ferguson is strongest in markets where the contractor already runs a plumbing-HVAC combo because the cross-trade account consolidates spend.

Johnstone Supply is a cooperative of 450+ member-owned branches across the US and Canada. Because each branch is an owner, Johnstone runs the most aggressive parts pricing in the market on capacitors, contactors, motors, and refrigeration components. The cooperative structure also means the year-end patronage rebate is often the largest of any chain (3-5% of qualifying spend returned annually).

Gemaire Distributors is a Watsco subsidiary and the dominant Carrier and Bryant distributor across the Southeast, Mid-Atlantic, and Texas. Gemaire owns the factory authorized dealer pipeline for Carrier residential in those markets, which means the contractors who want Carrier equipment at OEM dealer pricing have to go through Gemaire.

R.E. Michel Company is a privately held distributor with 280+ branches across the Mid-Atlantic, Northeast, and Midwest. R.E. Michel carries Goodman, Rheem, Trane, Bosch, and Mitsubishi and runs deep refrigeration and commercial parts inventory. Their pricing on commercial refrigeration parts is competitive with United Refrigeration in markets where both operate.

ABCO HVACR Supply + Solutions dominates the Northeast metro markets (NY, NJ, CT, PA, MA) and is the Carrier factory authorized dealer pipeline in those states. ABCO is where most New York metro HVAC contractors source Carrier residential and light commercial equipment.

United Refrigeration is the largest privately held HVAC and refrigeration distributor in the US with 400+ branches. United is strongest on commercial refrigeration, ice machines, walk-in coolers, and specialty parts. Most pure-residential shops use them as a secondary supplier for hard-to-find parts and commercial overflow.

A contractor on r/HVAC summarized the split: “Johnstone for parts because of the patronage check. Gemaire for Carrier. Ferguson for sheet metal and water heaters. United when one of those three is out of stock or the price is stupid.”

How to qualify for contractor pricing

Walking into any of the six chains with a personal credit card gets you cash-and-carry pricing, which is roughly the price a homeowner would pay if they could buy direct. Contractor pricing is gated behind a contractor account, and opening one is straightforward if you bring the right paperwork.

What every supply house wants to see:

• State contractor or mechanical license (or business license if your state does not require contractor licensing for HVAC)
• EPA Section 608 certification card for at least the account owner
• Business EIN and a filed certificate of formation for the LLC or corporation
• Certificate of liability insurance naming the supply house as a certificate holder
• One or two trade references (other suppliers, a bank, or a finance company)
• A signed personal guarantee from the owner for the Net 30 account application

Most chains will open a cash contractor account on the spot once the license and EPA card are verified. The Net 30 account application goes to credit underwriting and typically takes 5-10 business days. A clean personal credit score over 680 and an EIN that has filed at least one year of taxes will get approved without trouble.

The tiers most chains use:

Annual spend	Typical tier	Discount off list
$0-$25K	Cash / Tier 1	0-5% off list
$25K-$75K	Tier 2	5-10% off list
$75K-$150K	Tier 3	10-15% off list
$150K-$500K	Tier 4 / Premier	12-18% off list + rebate
$500K+	National account	Custom pricing + co-op

The mistake most contractors make is forgetting to requalify. The supply house quietly leaves you at the tier you opened at unless you ask. A contractor on the Owned and Operated podcast described pulling 7% out of his materials line by asking his Ferguson rep to run a 12-month spend report and bumping him from Tier 2 to Tier 4 retroactively, which triggered a $14,000 rebate check on volume that had already shipped.

Credit terms math: Net 30 is free working capital

The most underrated lever in the entire supply chain conversation is credit terms. Most HVAC contractors pay supply house invoices when they arrive without recognizing that the 30-day float is a no-interest line of credit.

The math:

A shop doing $1.5M in revenue with a 35% materials cost ratio spends roughly $525,000 a year at supply houses. That is about $44,000 a month in materials invoices. Net 30 terms mean the contractor is sitting on roughly $44,000 of supplier money at any given moment without paying a dollar of interest. That money funds payroll, truck fuel, and the AR gap between the day the job finishes and the day the customer pays.

For a $5M residential shop, the same math produces $145,000 to $175,000 of free working capital. For a $10M shop with combined HVAC, plumbing, and electrical, the working capital float can exceed $400,000.

The contractors who collapse usually collapsed the credit terms first. Burning a supplier with a 60-day-late invoice costs you Net 30 and forces you onto cash-and-carry overnight, which means every job from that day forward has to be funded out of operating cash. A residential HVAC owner on r/sweatystartup posted in early 2026 about getting cut off by Johnstone after one bad month: “Lost Net 30 in October, had to buy every condenser cash through November, by Christmas I was using credit cards to make payroll. Two years of clean payment history wiped out in 30 days.”

Two practical rules:

1. Pay supply house invoices on day 28, not day 30 and not day 5. Day 28 gives you the full float without triggering late-payment flags. Paying on day 5 throws away 23 days of working capital you already earned.
2. Take 2/10 Net 30 only if your cash position can support it without dipping into a line of credit. A 2% discount for paying 20 days early is a 36% APR equivalent return. That is a fantastic ROI if the cash is sitting in checking earning nothing. It is a terrible ROI if taking it forces you to draw on a 9% LOC to fund payroll.

Volume discount tiers and rebates

The published price book at any HVAC supply house is the starting point, not the ending point. Layered on top are tier discounts (covered above), spot promotions (factory pushes on slow-moving SKUs), and end-of-year rebates that most contractors never claim.

The rebate categories worth chasing in 2026:

• OEM volume rebates. Carrier, Trane, Lennox, Goodman, and Rheem all run tiered annual rebates on equipment shipments that flow back through the distributor. A contractor installing 80+ Carrier systems in a year is typically eligible for $200-$800 per system in retro rebates depending on the SEER tier and the year’s program.
• Distributor patronage rebates. Johnstone Supply members get an annual patronage dividend (typically 3-5% of qualifying spend). Ferguson runs a similar program for top-tier contractor accounts. R.E. Michel and Gemaire run quarterly spend rebates for accounts above tier 3.
• Co-op marketing funds. OEM dealer programs typically accrue 1-3% of equipment spend as co-op dollars that can be spent on advertising, truck wraps, or showroom signage. Most contractors leave 60-80% of accrued co-op on the table because they never submit the paperwork.
• Early-buy programs. Spring and fall early-buy windows (typically March and September) let contractors lock in 5-8% off list on condensers, furnaces, and heat pumps if they commit to a season’s volume upfront. The cash flow tradeoff is real but the discount usually beats borrowing cost.

A southeast HVAC owner on the Owned and Operated podcast described his rebate process: “We pull a spend report from every supplier in January. Then we send three emails. One to the rep asking what we qualified for. One to the OEM asking what dealer rebates we missed. One to the marketing person asking what co-op balance is unused. Last year that exercise was worth $43,000 across three suppliers.”

OEM dealer relationships: Carrier, Trane, Lennox, Goodman, Rheem

OEM dealer status is the layer above supply house tier pricing and it is where the biggest equipment discounts live. The major OEM programs in 2026:

• Carrier Factory Authorized Dealer (through Gemaire, ABCO, and other Watsco distributors). Top-tier FAD status unlocks 12-22% off equipment list, factory rebates, and access to consumer financing through Carrier’s lending partners.
• Trane Comfort Specialist (through Trane Supply and Ferguson). 10-18% off equipment list, plus the Trane brand premium in markets where homeowners specifically ask for Trane.
• Lennox Premier Dealer (through Lennox Stores). 8-15% off equipment list, strong co-op marketing program, and the homeowner financing through LennoxPros.
• Goodman / Daikin Dealer (through Gemaire, Goodman Distribution, and Ferguson). Less brand premium with homeowners but the lowest equipment cost of any major OEM, which protects margin on budget jobs.
• Rheem Pro Partner (through multiple distributors). Strong commercial water heater and tankless programs, decent residential HVAC rebates.

The tradeoff every OEM program asks for is loyalty. Most factory authorized dealer programs require a contractor to install at least 60-80% of jobs in the OEM’s equipment to maintain status. That commitment is what unlocks the deepest rebates and the homeowner financing, and it is also what kills negotiating leverage on the equipment line.

The unique-OEM-only-supplier trap

The biggest mistake mid-size HVAC contractors make is locking into a single OEM and a single distributor for that OEM. When Gemaire is your only Carrier source and Carrier is 90% of your installs, Gemaire knows you cannot walk a quote across the street. The contractor pricing creeps up over time, the rep stops returning calls about rebates, and the contractor pays 4-9% more on equipment than a contractor who splits between Carrier and Goodman.

The fix is not abandoning the OEM relationship. The fix is carrying a credible backup.

What most successful $2M-$10M shops do:

• Maintain primary OEM dealer status with Carrier, Trane, or Lennox for the brand premium on premium installs
• Carry a Goodman or Rheem account at a second distributor for budget jobs and replacement situations where the homeowner is shopping on price
• Pull quotes from both before every install over $8,000 and route the job to whichever lands the better net cost
• Renegotiate the primary OEM pricing every spring using the backup’s equipment quotes as leverage

A contractor on r/HVAC described the dynamic: “I told my Carrier rep I was going to start running 40% Goodman because the margin was killing me. He had a new pricing sheet on my desk in three days. Saved me $312 per condenser without me actually switching a single job.”

Common HVAC supply house mistakes

The patterns we see across hundreds of contractor conversations:

1. Never asking for the tier requalification. Most chains leave contractors at their original tier until the contractor asks. Pull a 12-month spend report annually and ask the rep to retier the account.
2. Paying invoices early without a discount. Day 28, not day 5. Use the full 30-day float.
3. Letting the parts guy choose the brand on every truck order. The parts counter staff has no incentive to give you the cheapest equivalent part. Train your techs to ask for the generic or universal part before accepting the OEM specific.
4. Single-supplier dependency. Even if 80% of your spend goes to one chain, keep an active account at a second so you can pull quotes when the primary gets lazy.
5. Ignoring co-op marketing accruals. A $1M shop is typically sitting on $5,000-$15,000 of unspent co-op at year-end. Most of it expires unused.
6. Not negotiating freight and delivery surcharges. Delivery fees are usually negotiable for tier 3+ accounts but only if you ask.
7. Buying refrigerant retail. R-410A, R-454B, and R-32 pricing varies by 20-30% between distributors on the same day. Always quote refrigerant separately and route to the cheapest source.
8. Not enrolling in the OEM rebate portals. Carrier, Trane, Lennox, and Goodman all run online rebate portals that require the contractor to register the install within 30-60 days. Miss the registration window and the rebate is forfeited.

The honest take

Supply house pricing is not a fixed cost. It is a negotiated cost that most HVAC contractors treat as fixed because they are too busy running jobs to work the supply chain. The contractors compounding the fastest in 2026 treat the materials line as a second profit center with its own quarterly review, its own KPIs, and its own rep management cadence.

A 5% improvement on materials at a $1.5M shop is $9,000 in pure net profit. A 10% improvement is $18,000. Neither requires raising a single customer price or adding a single job to the calendar. They require asking three questions every spring: what tier am I qualified for, what rebates have I missed, and what would my primary supplier do if I started splitting volume with a competitor.

The contractors who never ask those questions pay the spread. The contractors who ask annually keep it. The math is that simple and that consequential.

For the related operations playbooks, the HVAC pricing guide covers the markup math that turns materials cost into customer-facing flat-rate pricing, the HVAC tools list covers the truck stock that determines how often you have to drive to the supply house in the first place, and the HVAC business plan sets the revenue targets that determine which supply house tiers you can realistically qualify for. The HVAC marketing guide covers how to drive the call volume that funds the negotiating leverage, and marketing automation for contractors covers the systems that keep the pipeline full while you focus on the back-office levers. For shops looking at the full operating system, the HVAC contractor hub ties it together.

Close the loop on the supply chain and the materials line stops being the thing that quietly eats your margin every quarter.