Before You Buy a New HVAC System: 10 Things to Check First

Part of the Triple Check Homeowner Guide Series

A new heating and cooling system is one of the biggest checks most homeowners ever write. The problem is that most quotes compare boxes and prices, not the things that decide how the system actually performs. Use this list with every contractor you talk to — including us.

<p>Download the free printable checklist</p>

1. Get a Manual J Load Calculation

Ask for a room-by-room heat loss and heat gain calculation. "Three tons out, three tons in" is a guess, not a design. Oversized systems short-cycle, wear out sooner and leave the house humid in a Kansas summer.

2. Have the Ductwork Inspected

A new unit on leaky or undersized ducts performs like an old unit. Ask for static pressure readings and a duct inspection before you buy. Fixing ducts is often the cheapest comfort upgrade in the house.

3. Match the Indoor Coil and Outdoor Unit

Mismatched equipment loses efficiency and can void the warranty. Ask for the AHRI matched-system certificate number for the exact combination being quoted.

4. Replace the Line Set or Prove It Is Reusable

Old refrigerant lines can carry contamination and may be the wrong size for new equipment. Ask whether it will be replaced, or flushed and pressure tested. Our line set guide explains why this matters.

5. Know Which Refrigerant You Are Buying

R-410A is being phased down. Newer A2L systems use R-454B or R-32 with different parts and service needs. Read our breakdown of the 2025 refrigerant changes.

6. Compare SEER2 and HSPF2, Not Just Price

Higher efficiency pays back faster in some homes than others. Ask for an estimated operating-cost comparison for your house, not a brochure number.

7. Consider a Heat Pump or Dual-Fuel Setup

In Northeast Kansas, a heat pump with gas furnace backup can lower heating cost while keeping strong heat on the coldest nights. Ask for pricing on both before deciding.

8. Plan for Filtration and Humidity

A 4&ndash;5 inch media filter cabinet protects the equipment and your lungs. See why we use 5-inch filters. Add a humidifier or dehumidifier where the house needs it.

9. Read the Warranty Fine Print

Know the difference between parts and labor coverage, the registration deadline, and who actually performs warranty work.

10. Require Start-Up and Commissioning Numbers

Ask for superheat and subcooling, static pressure, temperature split and gas pressure readings in writing when the job is finished. A good installer is proud to hand them over.

Want a Second Set of Eyes on Your Quote?

Send us the quote you have. We will tell you honestly what looks right and what is missing &mdash; no pressure. Call (913) 426-2588, request an HVAC estimate, or see our HVAC installation service.

Next Guide in the Series

10 Things to Check Before Hiring an HVAC Contractor is coming next. Join the free Triple Check guide library and subscribers get it first.