Verify the fault
Request measurements, failed-part identification, cause and post-repair testing.
Repair vs. replacement
Put the diagnosis, cost and remaining life on one page.
Use a written repair estimate and a complete installed replacement proposal. The result explains which factors are driving the decision without pretending that age alone determines the answer.
Evidence first
Do not decide from a sales rule of thumb.
System condition, failure type, safety, comfort, full installation scope and local economics matter.
Normalize replacement
Include load calculation, equipment, ducts, electrical, permits, commissioning and labor warranty.
Use realistic energy
Compare modeled annual use under the same weather, thermostat and fuel-price assumptions.
Check incentives
Verify current federal, state, local and utility eligibility instead of subtracting a fixed credit.
NEXT STEP
Open quote comparator →Compare the written scopes side by side.
A lower replacement price may omit permits, electrical work or commissioning.