HVAC Installation and Upgrades in Leawood, KS
A new system is only as good as the load calculation behind it. Put a too-big air conditioner in a humid Johnson County summer and it short-cycles and leaves the house clammy; undersize a furnace and it can’t hold temperature on a 13°F night. 7th Degree Heating and Air installs and upgrades HVAC systems across Leawood and eastern Johnson County the right way — starting with the math, not a tonnage guess.
How We Size and Select
Every installation begins with an ACCA Manual J load calculation that accounts for your home’s square footage, insulation, windows, orientation, and air leakage — then Manual S to select equipment that matches that load, and Manual D to verify the ductwork can carry it. The difference is real: a 1960s north-Leawood ranch with original windows and an under-insulated attic can carry a far higher load per square foot than a 2015 south-Leawood build framed to the IECC 2021 envelope (R-20 walls, R-49 ceiling, U-0.32 windows). New equipment is selected for the current R-454B refrigerant standard, and we right-size for the latent (humidity) load that defines comfort here, not just the temperature.
Our Installation Services
HVAC Replacement
Full furnace-and-AC or heat-pump system replacement, sized with Manual J and matched with Manual S for efficiency that lasts.
Ductless Mini-Splits
Ductless systems for additions, finished basements, bonus rooms, and older homes where running new ductwork isn’t practical.
Zoned HVAC
Multi-zone control for two-story homes and rooms that never seem to match the thermostat — comfort where you actually live.
Smart Thermostats
Smart and programmable thermostat installation and setup, configured correctly for your equipment and staging.
Thermostat Repair
Diagnosis and repair of thermostat and control wiring faults that mimic bigger system problems.
Air Handler Services
Air handler installation, replacement, and repair — including the blower and coil work that airflow and humidity control depend on.
Frequently Asked Questions
- How do you decide what size system my home needs?
- With an ACCA Manual J load calculation, not a rule-of-thumb tonnage estimate. We account for square footage, insulation, windows, orientation, and air leakage, then use Manual S to select matching equipment and Manual D to confirm the ducts can carry it. In a humid climate, getting size right is what prevents an oversized system that short-cycles and leaves the house damp.
- Is a ductless mini-split better than a central system?
- It depends on the space. For a whole home with existing ductwork, central is usually the right call. For an addition, a finished basement, a bonus room over a garage, or an older home without ducts, a ductless mini-split delivers efficient, zoned comfort without the cost and disruption of running new ducts. We’ll tell you honestly which fits your situation.
- What is zoning and do I need it?
- Zoning splits your home into independently controlled areas, so the upstairs and downstairs — or a sunroom and the rest of the house — can hold different temperatures. It’s especially useful in two-story Johnson County homes where heat rises and the upstairs runs warm in summer. If you have rooms that never match the thermostat, zoning is often the fix.
- Are smart thermostats worth it?
- For most homes, yes — when they’re set up correctly for your equipment. A smart thermostat can cut runtime and energy use with scheduling and remote control, but it has to be wired and configured for your system’s staging to work as intended. A two-stage furnace or a heat pump misconfigured on a basic thermostat can actually run worse, which is why we set them up properly.
- What refrigerant will my new air conditioner use?
- New residential cooling equipment now uses R-454B, the lower-global-warming-potential refrigerant that replaced R-410A as of the 2025 transition. We install current-standard equipment and factor refrigerant compatibility into every replacement so you’re not buying into a phased-out system.
Contact 7th Degree Heating and Air
Serving Leawood, Overland Park, Prairie Village, Mission, Merriam, and Lenexa with right-sized installations and 24/7 emergency support.
- 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
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)