An HVAC business operating on handshakes or generic service orders is one dispute away from learning what a service agreement is supposed to do. Most disputes between residential HVAC contractors and homeowners trace back to one of the same eight things being unclear or missing in writing. Each gap below has a fix.
1. Scope of work — line-itemed, not buried in a paragraph
The single biggest source of “this isn’t what we agreed to” disputes. A clear scope of work includes:
- Specific equipment (make, model, capacity, serial number where applicable)
- Specific labor (“install new furnace including disconnect and reconnect of existing ductwork — does NOT include ductwork modifications, electrical upgrades, or gas line modifications unless separately authorized”)
- Explicit exclusions (“Permitting, electrical panel upgrade if needed, drywall repair after access, and removal of asbestos-containing materials are not included in this quote.”)
When the customer wants to add work mid-job, the contractor issues a change order. When the contract documented what’s excluded, the change order pricing isn’t a negotiation.
2. Payment terms — when, how, and consequences of late
- Deposit required at signing (or not — but state it either way)
- Progress payment trigger (“balance due upon equipment delivery”)
- Final payment trigger (“upon completion of installation and operational test”)
- Acceptable payment methods
- Late payment terms: interest rate (capped by state usury limits), late fee structure, lien rights preserved
- State-specific cooling-off period acknowledgment for residential work — most states give a three-day right of rescission on in-home solicitations
3. Warranty — manufacturer versus labor, clearly separated
Customers don’t know that the manufacturer’s warranty is 10 years on the heat exchanger and the contractor’s labor warranty is 12 months on installation. They assume “the unit is under warranty” means everything is covered. The agreement should separate:
- Equipment warranty (per manufacturer’s terms — heat exchanger life on most major brands, varying parts coverage)
- Labor warranty (12 months from installation date, covering labor charges on warranty-covered parts and on workmanship defects)
- Exclusions (damage from improper maintenance, unauthorized modifications, abnormal use)
- Limited remedy clause (“Customer’s exclusive remedy is repair or replacement at Contractor’s option”)
4. Indemnity and limitation of liability
For residential service, the essentials:
- Cap on consequential damages — without a cap, water damage from a future equipment failure can trigger basement-flooding claims
- Customer’s obligation to provide reasonable access and remove personal property from the work area
- Contractor not responsible for pre-existing conditions in the home’s systems
State law limits the enforceability of broad waivers. What’s typically enforceable is a cap on exposure at contract price or a multiple thereof. Worth a one-time review by counsel licensed in the contractor’s operating state.
5. Permits and code compliance — assigned responsibility
Many homeowners don’t realize permits are their responsibility (or the contractor’s, depending on state and county). Either approach works; ambiguity does not. The agreement should say either:
- “Contractor will obtain required permits. Permit fees are billed to Customer at cost plus 10% administrative fee.”
- Or: “Customer is responsible for obtaining required permits prior to start of work.”
6. Access and site conditions
What the customer must provide for work to proceed:
- Clear access to the work area
- Functioning electrical service
- Pets contained
- Notice if hazardous materials may be present (asbestos, lead, mold)
When conditions aren’t met and the job has to reschedule, a trip fee applies. The agreement should state the fee in advance.
7. Mechanics lien rights — state-specific notice required
Lien rights in residential work are state-specific. Most states require the contractor to give specific notice at contract signing to preserve lien rights — failure to provide the right notice waives them. Generic service-agreement templates often include either no lien notice or a notice from the wrong state. Either error means no lien.
For multi-state operations, the agreement needs state-specific addendums. A generic lien notice is worse than none — it creates the false impression of preserved rights.
8. Dispute resolution
A short clause:
- The parties will first attempt to resolve disputes by direct discussion
- If unresolved within 30 days, the parties will mediate before any litigation
- Venue and choice-of-law (county and state where work was performed)
- Optional arbitration provision (a separate decision with separate trade-offs)
The mediation-first requirement keeps small disputes out of small claims court long enough that most resolve.
What most HVAC service templates get wrong
Generic boilerplate from another industry. A template written for general contracting won’t include the model-number-specific scope HVAC requires.
No state-specific lien notice. Templates assume generic state rules. Most are wrong for any specific state.
Confused warranty language. Mixing manufacturer warranty and labor warranty into one paragraph causes the majority of warranty disputes.
No change order process. Without a written change order procedure, every mid-job addition becomes a verbal agreement that the customer remembers differently than the contractor.
A service intake to pair with your agreement
Templateez offers an HVAC client intake and service questionnaire — a professional starting point for capturing the scope, problem description, property details, scheduling, and budget for a job before it gets quoted. The intake covers job administration, client information, service address and access notes, service-requested checkboxes (repair, preventive maintenance, installation, replacement, ductwork, refrigerant, indoor air quality, heat pump, thermostat, electrical, hydronic), and a scope-of-work summary. The questionnaire collects the client’s own description of the problem, service preferences, scheduling availability, and budget. The set is $12.99.
View the HVAC Services Intake →
The intake captures what you need to quote and schedule a job. The eight clauses above belong in the service agreement contract — a separate document executed alongside the intake. A solid service intake and a sound service agreement are complementary; the intake records what the customer wants done, and the agreement governs how the work is performed and paid for.