Contractor Quote Checklist
AC Repair Vs Replacement Quote Checklist Before You Approve
Short answer: compare AC repair and replacement quotes by asking what failed, whether the repair solves the root cause, how refrigerant and airflow were checked, whether replacement sizing uses a real load calculation, what duct or electrical work is included, what warranties apply, and what could change the price after approval.
This guide is for the homeowner whose central air conditioner still runs, but badly: warm rooms, repeated service calls, a noisy condenser, or a technician saying the next repair may not be worth it. The wrong move is to compare one repair number with one replacement number as if they answer the same question.
A repair quote should prove the diagnosis. A replacement quote should prove the design. This article does not invent a national AC price. It shows the questions that make each quote easier to judge before the heat wave turns a rushed decision into an expensive one.
Start With The Failure, Not The Sales Option
Ask the contractor to name the failed part, the evidence behind the diagnosis, and whether the failure is isolated or connected to airflow, refrigerant charge, thermostat settings, dirty coils, duct leakage, or electrical control issues.
DOE maintenance guidance points to items technicians commonly check, including refrigerant charge, leaks, airflow across the evaporator coil, electrical terminals, belts, motors, and duct leakage. If the repair quote skips the diagnostic trail, the homeowner is approving a guess.
- What symptom was observed?
- What test confirmed the failed component?
- What else was checked and ruled out?
- Will the repair restore normal operation or only buy time?
- What warranty covers the replaced part and labor?
Separate A Repairable Part From A System Problem
A capacitor, contactor, fan motor, thermostat, drain switch, or minor wiring issue may be a straightforward repair. Repeated refrigerant loss, compressor failure, poor airflow, oversized equipment, undersized returns, or failing ductwork can point to a bigger decision.
Ask whether the quote fixes the cause or only the visible symptom. If the contractor recommends replacement because the system is old, ask what condition supports that recommendation: compressor readings, refrigerant type, coil condition, repeated failures, efficiency, comfort complaints, or unavailable parts.
Refrigerant Language Should Be Specific
Refrigerant can change the decision because leak repair, recovery, recharge, and equipment compatibility are not casual details. The quote should name the refrigerant type, say whether a leak test was performed, and explain whether the proposed repair includes refrigerant recovery or recharge.
Vague phrases like “add Freon” or “top off system” are not enough. Ask whether the contractor is repairing a leak, charging to manufacturer specifications, and documenting the amount added. A quote that keeps adding refrigerant without explaining the leak can become a recurring bill.
Replacement Requires Load Sizing, Not Guessing From The Old Unit
DOE central air guidance says a contractor should correctly size central AC equipment using an ACCA Manual J load calculation and select equipment using Manual S. That matters because the old unit may already be oversized or undersized.
Ask the replacement quote to state the load calculation method, assumed insulation and window conditions, room comfort complaints, return air limitations, and whether duct sizing or registers need attention. Bigger equipment can still leave the home humid or uneven if airflow is wrong.
Ductwork And Electrical Scope Can Decide The Real Quote
A clean replacement quote should say whether existing ducts, refrigerant lines, condensate drain, disconnect, breaker, thermostat wiring, pad, and line-set cover will be reused, replaced, modified, or excluded.
If the repair quote mentions airflow but the replacement quote ignores ducts, stop and ask. Comfort complaints often come from distribution problems, not only equipment age.
Compare Comfort Risk, Warranty, And Downtime
The lowest repair quote may be reasonable if the system is otherwise healthy and the part warranty is clear. Replacement may be reasonable if the repair is expensive, parts are uncertain, efficiency is poor, comfort is bad, or another major failure is likely soon.
Ask each contractor to put the risk in writing. What happens if the repair does not hold? Is diagnostic labor credited toward replacement? How long will the home be without cooling? What equipment, labor, compressor, coil, and thermostat warranties apply?
AC Quote Decision Table
| Decision Area | Repair Quote Should Show | Replacement Quote Should Show |
|---|---|---|
| Diagnosis | Failed part, test results, root-cause checks | Why repair is not the recommended path |
| Refrigerant | Type, leak test, recovery/recharge scope | Compatible equipment and line-set assumptions |
| Airflow | Filter, coil, blower, return, duct leakage checks | Duct sizing, registers, static pressure assumptions |
| Sizing | Not usually needed unless system problems exist | Manual J load calculation and equipment selection basis |
| Electrical | Part, wiring, control sequence, disconnect safety | Breaker, disconnect, thermostat, wiring scope |
| Warranty | Part and labor coverage for the repair | Equipment, compressor, coil, parts, and labor coverage |
| Change orders | What could change after diagnosis | What could change after removal or install starts |
Message To Send Before Approval
Please update the quote with the confirmed AC diagnosis, refrigerant type and leak assumptions, airflow checks, repair warranty, replacement sizing method if applicable, duct and electrical scope, included permits or inspections, and the written change-order rule before I decide between repair and replacement.
FAQ
How do I know if AC repair or replacement is better?
You need a repair quote that proves the diagnosis and a replacement quote that proves the design. Compare the failed part, system age, refrigerant risk, airflow, comfort problems, warranty, downtime, and likely next failure instead of comparing totals alone.
Should an AC replacement quote include a load calculation?
Yes. For central air conditioning, the replacement quote should explain how the contractor sized the equipment, including load calculation assumptions and duct or airflow constraints.
What is a red flag in an AC repair quote?
A quote that only says “replace part” or “add refrigerant” without test results, leak assumptions, warranty terms, and what happens if the symptom returns is not ready to approve.
Can a cheap AC repair be the right choice?
Yes, if the failed part is isolated, the system otherwise operates correctly, the warranty is clear, and the homeowner understands the remaining risk. The quote should make that logic explicit.
Sources Checked
- Department of Energy: Air Conditioner Maintenance
- Department of Energy: Central Air Conditioning
- Department of Energy: Purchasing Energy-Efficient Residential Central Air Conditioners
- FTC: How To Avoid a Home Improvement Scam
The Review Rule
Approve the AC option that explains the risk you are accepting. A repair should show why the failure is limited. A replacement should show why the new system will fit the house, airflow, electrical conditions, and comfort goals.