Buying a House? What to Check on the HVAC Before You Close

Buying a home is one of the biggest purchases you'll ever make, and the heating and cooling system is one of the most expensive things in it to replace. A standard home inspection touches the HVAC, but it rarely goes deep. Before you close, it's worth knowing exactly what to check — because a tired furnace or AC can turn into a five-figure surprise your first year.

How old is the equipment?

Start with age. Furnaces typically last 15 to 20 years and air conditioners 12 to 15. Look for the manufacture date on the unit's data plate. If the system is near or past those ranges, factor a replacement into your offer or your budget. A working older unit isn't a dealbreaker, but it shouldn't be priced as if it's brand new.

Has it been maintained?

Ask for service records. A system with documented annual maintenance is far more likely to have life left than one that's been ignored. No records isn't necessarily bad, but it means you're buying an unknown. Our guide on what a maintenance plan covers shows what proper upkeep looks like.

Does everything actually work?

Test both heating and cooling during the inspection if the season allows. Confirm the AC blows cold and the furnace produces heat, that airflow is strong at the vents, and that there are no strange noises or smells. A system that struggles during a calm inspection will struggle more under real demand.

What about the water heater?

Don't forget the water heater — it's easy to overlook. Check its age, look for rust or corrosion at the base, and ask about the last time it was flushed. In our hard-water region, sediment shortens water heater life, as we explain in this guide. A unit near the end of its life is a near-term expense to plan for.

Look at the whole system, not just the box

Ductwork condition, insulation, thermostat type, and refrigerant type all matter. A system using phased-out R-22 refrigerant will be expensive to service. Uneven temperatures between rooms can signal ductwork or sizing problems — see why sizing matters. These details affect both comfort and future cost.

Get a pre-purchase HVAC assessment

The smartest move many buyers make is a dedicated HVAC inspection before closing — separate from the general home inspection. A technician can assess remaining life, flag safety issues like a cracked heat exchanger, and give you a realistic replacement timeline you can use in negotiations. That's information worth far more than the cost of the visit.

If the assessment shows replacement is coming, you'll want to know the numbers. Use our pricing calculator to estimate costs and review financing options so a needed upgrade doesn't blow your moving budget.

Buy with confidence

Knowing the true condition of the HVAC system protects you from surprises and strengthens your negotiating position. For more, read HVAC red flags inspectors often miss and our new homeowner checklist. Ready for a pre-purchase inspection? Contact our team and check our current coupons.