Furnace Installation in Leawood, KS

A furnace in Johnson County has to deliver on the coldest night of the year — a roughly 13°F design low, with cold snaps that go lower. That’s not the night to discover the unit was sized by guesswork or vented incorrectly. 7th Degree Heating and Air installs gas and electric furnaces in Leawood that are sized with a load calculation, matched to your home and budget, and started up with combustion verified and carbon monoxide checked — because a furnace is a combustion appliance, not just a box that blows warm air.

Sized and Selected the Right Way

Every furnace install starts with an ACCA Manual J load calculation, then Manual S to match the equipment. An oversized furnace short-cycles, wears itself out, and leaves rooms unevenly heated; an undersized one can’t hold temperature when it matters. We also help you weigh efficiency honestly: a standard 80% AFUE furnace costs less up front, while a high-efficiency 90%+ AFUE condensing furnace burns less gas and recovers more heat but requires different (PVC) venting and a condensate drain. Which one pencils out depends on your home, your gas usage, and how long you’ll stay.

What Our Furnace Installation Includes

• Load calculation and equipment selection sized to your home, with single-stage, two-stage, or modulating options explained.
• Code-compliant venting — correct flue or PVC venting for the furnace type, sized and routed properly.
• Gas line and pressure verification on your natural gas service.
• Removal and disposal of the old furnace.
• Permits pulled through the Johnson County building department, and warranty registered.
• Combustion verification on startup — manifold pressure set and carbon monoxide checked air-free, not assumed.

Frequently Asked Questions

What size furnace do I need?

The size a Manual J load calculation says you need — not the size of your old furnace, which may have been oversized to begin with. We measure your home’s heat loss based on square footage, insulation, windows, and air sealing, then select to match. Right-sizing avoids the short-cycling and uneven heating that come from an oversized unit.

What’s the difference between 80% and 90%+ AFUE?

AFUE is how much of the fuel becomes usable heat. An 80% furnace sends 20% up the flue and uses standard metal venting; a 90%+ condensing furnace captures more heat, vents through PVC, and produces condensate that needs a drain. The high-efficiency unit costs more up front and saves on gas over time — we’ll run the comparison for your specific situation rather than assuming.

How long does a furnace installation take?

A standard replacement is usually a single day. Switching efficiency types (which changes the venting), relocating the unit, or adding gas or electrical work can extend that. We give you a realistic timeline with the quote.

Should I get a gas or electric furnace — or a heat pump?

Most Johnson County homes are on natural gas, and a gas furnace is often the most cost-effective heat for our winters. That said, a heat pump or dual-fuel system can make sense depending on your energy costs and goals. We’ll lay out the options for your home rather than pushing one path.

Do you check for safety after installation?

Always. We set manifold gas pressure to spec and measure carbon monoxide air-free at startup, confirm the venting draws correctly, and verify the heat exchanger and safeties operate as designed. A furnace is a combustion appliance, and we don’t consider an install finished until it’s confirmed safe.

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Contact 7th Degree Heating and Air

Serving Leawood, Overland Park, Prairie Village, Mission, Merriam, and Lenexa with right-sized furnace installations and 24/7 emergency heating service.

• Emergency Line (24/7): (913) 354-6552
• Address: 12720 Catalina St, Leawood, KS 66209
• Email: info@7thdegreeheatingandair.xyz
• Johnson County Class “DM” Mechanical License: DM-24-11873
• EPA Section 608 Universal: EPA-608-U-457921

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Office Hours

• Emergency Service: 24 hours a day, 7 days a week
• Office Staff: Monday – Saturday, 9:00 AM – 5:00 PM
• Sunday: By appointment
• Closed: Holidays (emergency line always active)