How Much to Charge for Referring an HVAC Install to Another Company

I have been running my own HVAC business for about 15 years. During that time I have referred out hundreds of jobs: overflow work during peak season, specialty installs outside my wheelhouse, customers in zip codes I do not service. For the first few years I did those referrals for free. I would call a buddy, hand over the customer’s number, and move on with my day.

Then I started paying attention to the numbers. A $12,000 furnace-and-AC changeout I referred to another company. A $7,500 ductless mini-split install for a customer who needed it done next week when I was booked out three weeks. A $9,000 commercial rooftop unit replacement I could not touch because I am residential-only. That was almost $30,000 in work I handed over in a single summer, and I got nothing for it.

That is when I got serious about referral fee pricing. Not because I wanted to turn my contact list into a side hustle, but because my reputation was doing real work for the companies I was sending customers to, and I deserved to be compensated for it.

If you are an HVAC contractor who sends work to other companies (whether it is overflow, out-of-area, or specialty jobs) this is exactly how to figure out what to charge, how to structure the arrangement, and how to avoid the problems that blow up referral partnerships.

What Is a Normal HVAC Referral Fee?

An HVAC referral fee is a payment from one contractor to another for sending a qualified customer their way. The referring contractor (sender) earns a percentage of the job value or a flat dollar amount when the receiving contractor (receiver) closes and completes the work.

In home services, referral fees typically fall between 5% and 15% of the total job value. For HVAC specifically, here is what I have seen and what I use:

• 5% to 8% for a name-and-number pass. You give the customer the other contractor’s info and let them take it from there. The receiver does all the selling, quoting, and closing.
• 10% to 12% for a warm handoff. You personally call the receiver, explain the job, vouch for the customer, and maybe even do a three-way intro call or text. Your endorsement is a big part of why the customer hires them.
• 12% to 15% for heavy involvement. You walked the job, assessed the system, gave the customer a rough idea of what they need, and then connected them with the right installer. The receiver is essentially getting a pre-qualified, pre-sold customer.

Those ranges are consistent across the trades I work with: plumbers, electricians, roofers, and other HVAC companies. If you work alongside plumbers who grow through word of mouth or roofers setting up referral fee agreements, the numbers will look familiar.

Flat Fee vs. Percentage: Which One Makes Sense for HVAC

This is one of the first decisions you need to make, and the right answer depends on the kind of work you are referring.

When a percentage works best

Percentage-based fees make sense when the job value varies a lot. HVAC installs can range from $4,000 for a basic furnace swap to $25,000 or more for a full system replacement with ductwork. If you are referring a mix of small and large jobs, a percentage ensures you are paid proportionally. A 10% fee on a $15,000 job is $1,500. That same 10% on a $5,000 job is $500. Both feel fair to the receiver because the fee scales with the revenue.

Percentages also make sense when you do not know the final job value upfront. A customer calls you about a furnace replacement, but the receiver might also sell them an AC unit, a humidifier, and a new thermostat. A percentage captures the full value of what you sent their way.

When a flat fee works best

Flat fees are simpler and work well for predictable, lower-value jobs. If you are referring service calls, tune-ups, or minor repairs (work that runs $300 to $800) a percentage can feel like nickels. Nobody wants to track and pay out $30 on a $300 service call. A flat $50 or $100 per referral is cleaner for both sides.

I use flat fees for maintenance and repair referrals: $75 per referral that turns into a completed service call. For installs, I use a percentage. The dollar values on installs are high enough that a percentage makes real money, and the receiver still comes out ahead because they did not spend a dime on advertising to get that customer.

Quick comparison

• Percentage (5% to 15%): Best for installs, replacements, and large jobs. Scales with job value. Requires knowing the final invoice amount.
• Flat fee ($50 to $300): Best for service calls, tune-ups, and repairs. Simple to track. No need to verify invoice totals.
• Hybrid: Flat fee for repairs, percentage for installs. This is what I do, and it keeps things straightforward with my referral partners.

When to Get Paid: Upfront vs. After the Job Closes

This is where a lot of referral arrangements fall apart. The referring contractor sends work, the receiving contractor closes the deal, and then weeks go by with no payment. Or the receiver says the customer has not paid yet. Or the scope changed and the job value was lower than expected. I have seen every version of this conversation.

Payment after completion is the industry standard

In most HVAC referral arrangements, the fee is paid after the job is complete and the customer has paid in full. This is the most common structure because it is fair to both sides. The receiver does not pay for a lead that never converts, and the sender gets paid on actual revenue, not estimates.

The downside is the wait. An HVAC install might not happen for two to four weeks after the referral, and then the customer might take another week or two to pay the final invoice. So you could be looking at six weeks between the referral and your fee hitting your account. That is normal, but you need to plan for it.

When upfront payment makes sense

Some contractors charge an upfront referral fee: a flat amount paid when the customer’s contact information changes hands, regardless of whether the job closes. This is more common in lead-generation businesses than in peer-to-peer referrals between contractors, and I do not recommend it for most situations.

Here is why: if you charge upfront, the receiver is paying for a lead, not a closed job. That changes the dynamic. They are going to be more selective about which referrals they accept. They are going to push back on customers who are not ready to buy. And if a referral does not convert, they are going to resent paying for it. That resentment kills referral partnerships.

The one exception I have seen work is when a contractor has a very high close rate on referred work and the receiver knows it. If 90% of the customers you send actually book, an upfront flat fee of $100 to $200 can be reasonable because the receiver knows the odds are in their favor. But even then, I prefer post-completion payment. It keeps the trust clean.

Set a payment deadline

Whatever timing you agree on, put a deadline on it. I use “within 14 days of customer payment in full.” That gives the receiver enough time to collect from the homeowner and process my fee, without leaving it open-ended. If you do not set a deadline, “after the job closes” can quietly become “whenever I get around to it.”

Structuring Agreements That Protect Both Sides

I learned this the hard way. Early on, I had a verbal agreement with another HVAC company. I sent them a customer for a $16,000 dual-zone mini-split install. The job went well. Three weeks later I asked about my referral fee. The owner said he thought we had agreed on 5%. I was sure we said 10%. We had no written record. We eventually split the difference, but the relationship was never the same.

Written agreements do not have to be complicated. They just have to be clear.

What a good referral agreement covers

• The fee structure. Percentage, flat fee, or hybrid. Spell it out.
• When the fee is owed. After customer payment in full, after job completion, or at some other defined trigger.
• Payment deadline. How many days after the trigger does the receiver have to pay the sender.
• What counts as a referral. Does it only cover the initial job, or does it include add-on work sold during the same visit? What about a callback from the same customer six months later? Define the scope.
• Duration. Does this agreement cover one referral, all referrals for the next year, or an ongoing arrangement until someone cancels? I prefer open-ended agreements with a 30-day cancellation clause.
• What happens if the job goes wrong. This is the one most people skip, and it matters. More on this below.

Handling callbacks and warranty issues on referred work

Here is a scenario I have dealt with more than once: I refer a customer for a heat pump install. The receiver does the job. Two months later, the customer calls me (not the installer) because the unit is short-cycling. They called me because I am the one who recommended the company, and in their mind, I am still responsible.

Your agreement needs to address who handles post-install issues. The receiver should be fully responsible for their own workmanship and warranty, and the customer should know that before the job starts. I make this explicit when I hand off the referral: “You are hiring them directly. They are a separate company. They handle their own warranty and service.”

But you should also decide upfront what happens to the referral fee if the job goes sideways. My personal rule is simple: if the receiver has to go back and redo significant work because of their own mistake, and the customer is unhappy enough to complain to me about it, I return the referral fee. I have only had to do that twice in 15 years. But having that policy in writing keeps both sides honest.

Protecting your reputation

This is the part that matters more than the money. When you refer a customer, your name is attached to that job. If the receiver does bad work, the customer does not blame the receiver first. They blame you for recommending them.

I only refer contractors whose work I have seen on actual job sites. Not someone I met at a supply house. Not someone who seems like a good guy. Someone whose installs I have physically inspected. I keep a short list (two other HVAC companies, a plumber, and an electrician) and I check in with them regularly.

If you want to read about how one HVAC contractor handles overflow referrals and vets their partners, that post goes deeper on the trust side of this equation.

Real Numbers: What HVAC Referral Fees Look Like on Actual Jobs

Theory is fine, but here is what the math looks like on real work. These are based on my own referral activity over the past few years.

• Residential furnace replacement, $6,500 job. I gave a warm handoff to another HVAC company because I was booked solid in December. 10% fee = $650. The receiver paid me within two weeks of the customer’s final payment.
• Full system changeout (furnace + AC + coil), $14,000 job. Customer was outside my service area but came to me through a GC I work with. I made the intro, shared the job details, and let the receiver take it. 10% fee = $1,400.
• Ductless mini-split install, $8,200 job. I do not do ductless work. Referred to a company that specializes in it. 8% fee = $656. Lower percentage because I did a name-and-number pass, not a warm handoff.
• Seasonal tune-up referral. A customer called me for AC maintenance but they were 45 minutes outside my area. Sent them to a local tech. Flat fee of $75.

Over the course of a year, referral fees from jobs I could not take myself add up to meaningful income. And the contractors on the receiving end are happy to pay because they are getting customers at a fraction of what a Google Ads lead would cost them.

Common Mistakes That Kill HVAC Referral Partnerships

I have seen referral arrangements between HVAC contractors fall apart for a handful of recurring reasons. Here is what to watch out for.

• No written agreement. I already covered this, but it bears repeating. If the terms are not in writing, they do not exist. Memory is unreliable and people remember numbers differently when money is on the line.
• Chasing payment. If you have to remind someone three times to pay your referral fee, the arrangement is broken. Set a clear payment deadline and stick to it. If the receiver consistently pays late, stop sending them work.
• Not disclosing to the customer. Some states have rules about contractor-to-contractor referral fee disclosure. Even where it is not legally required, tell the homeowner. A simple “full disclosure, we have a referral arrangement, but his pricing to you is the same either way” goes a long way. Hiding it creates problems if the customer finds out later.
• Referring too broadly. If you send work to anyone with a license and a truck, you are going to get burned. Refer selectively. Your reputation is the whole foundation of this arrangement.
• Not tracking referrals. If you cannot tell me how many referrals you sent last quarter and what happened with each one, you are losing money. Even a simple list on your phone (customer name, date, who you referred them to, job value, fee owed, fee paid) is better than nothing.

State Rules and Licensing: Know What Applies to You

I am not a lawyer and this is not legal advice. But I will tell you what I have learned from running my business: some states have specific rules about referral fees between contractors. A few things to check with your state’s contractor licensing board:

• Whether your state requires written disclosure of referral fee arrangements to the homeowner.
• Whether you need to be a licensed contractor in the specific trade you are referring to in order to collect a fee. In some states, an HVAC contractor collecting a fee for referring a plumbing job might need a general contractor license.
• Whether referral fee income needs to be reported differently on your taxes. Talk to your accountant about this.

Spending 30 minutes researching your state’s rules is time well spent. A compliance issue can cost you your license, and no referral fee is worth that.

Putting It All Together

HVAC referral fee pricing is not complicated. The industry norms are well-established: 5% to 15% for installs depending on your involvement, flat fees for smaller service work, payment after the job closes, and a simple written agreement that covers the fee, the timeline, and what happens if something goes wrong.

The harder part is building the kind of trust that makes referral partnerships last. That means being selective about who you refer to, being transparent with homeowners, following up on every referral you send, and paying promptly when you are on the receiving end.

If you are already sending work to other HVAC companies (or to plumbers, electricians, or roofers) and you are not charging a referral fee, you are leaving money on the table. Your reputation earned that customer’s trust, and the contractor who benefits from it should recognize that.

Start with one partner. Agree on terms. Put it in writing. Send a referral. Get paid. Then do it again. If you want a clean way to set terms upfront and handle the payment side without awkward conversations, take a look at what PureIntro offers for home services contractors.

This post reflects one professional’s experience and is for informational purposes only. It is not business, legal, financial, or professional advice. Results described are individual and not guaranteed. Referral fee arrangements may be subject to state and local regulations. Consult a qualified professional for guidance specific to your situation. PureIntro facilitates referral tracking and payment processing but does not guarantee payments between users or any particular business outcome.