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HVAC frequently asked questions

The questions homeowners ask most are what a system costs, how long it lasts, whether to repair or replace, and whether tax credits apply. In 2026, full replacement generally runs $5,000 to $28,000 (CBS News), furnaces last 15 to 30 years and AC and heat pumps 15 to 20 (Carrier), and the IRS states the 25C credit applies to property placed in service before December 31, 2025.

Most bad HVAC outcomes come from three things: buying under time pressure during a breakdown, accepting a single bid, and skipping the load calculation. Those are all avoidable, and avoiding them costs nothing but a few days.

The second most common problem is comparing bids that aren't comparable. If one quote includes duct replacement and another doesn't, the cheaper one isn't cheaper. HVAC Project Cost puts duct repairs at $500 to $1,500 and full replacement at $2,000 to $5,000 — enough to explain most confusing price gaps.

If you take one thing from this page: get the total cash price in writing, from three contractors, for the same defined scope, and don't sign on the first visit.

How to choose

Never buy on the first visit
Same-day-only pricing is a pressure tactic, not a discount.
Three bids, one scope
Write the scope yourself and hand the same page to each bidder.
Verify the license and the EPA 608 certification
State board for the license; EPA Section 608 is federally required for refrigerant work.
Ask for the Manual J output
The document, not a verbal assurance.
Check tax credits at the IRS, not the sales sheet
The IRS is the authority on federal credit eligibility and deadlines.
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CBS News reports $5,000 to $28,000 nationally for full replacement including equipment and labor, with most 2,000 sq ft homes landing between $7,000 and $20,000.
Carrier cites 15 to 30 years for furnaces and 15 to 20 years for air conditioners and heat pumps, depending heavily on sizing, installation quality and maintenance.
The IRS states the Energy Efficient Home Improvement Credit applies to qualifying property placed in service before December 31, 2025. Check the IRS page or a tax professional for current status before relying on it.
No. Lennox states existing R-410A systems can continue to be serviced, though supply of that refrigerant is expected to tighten and get more expensive.
Buying under emergency pressure without a load calculation or competing bids. It's the most reliable way to overpay for a system that doesn't fit the house.
Sources

Where these figures come from

You know more than the last homeowner they quoted.

That is worth something only while you are still choosing. Tell us what is going on and we will match you with a few hvac pros whose licence and insurance we have already checked — free, no obligation.

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