AC Installation in Lenexa, KS
A new air conditioner in Lenexa has to suit a city of two halves — historic homes near Old Town and the large, modern builds spreading west toward City Center and Renner. Those two carry very different cooling loads, and sizing one by the other’s rule gets it wrong. 7th Degree Heating and Air installs cooling systems across Lenexa, sized with a load calculation specific to the home, reaching eastern Lenexa quickly from our Leawood base and covering the western subdivisions too.
Sizing for New West Lenexa vs. Historic Old Town
This is where local knowledge pays off. A modern west-Lenexa home, framed to today’s IECC envelope (R-20 walls, R-49 ceiling, U-0.32 windows) and tightly sealed, carries a lower cooling load than its square footage suggests — so a system sized by rule of thumb gets oversized, short-cycles, and leaves the house cool but humid. A historic Old Town home, with original construction, sits at the other end. We run an ACCA Manual J load calculation, match equipment with Manual S, and verify ducts with Manual D, sizing for the latent humidity load that defines comfort in our mixed-humid Climate Zone 4A. For larger newer floor plans with a hot upstairs, we’ll also discuss whether zoning belongs in the plan.
What a Lenexa Installation Includes
- Manual J load calculation specific to your home and its construction era.
- R-454B-compliant equipment meeting the current refrigerant standard.
- Zoning discussion for larger newer homes where comfort varies floor to floor.
- Old unit removed, refrigerant recovered per EPA 608.
- Permits pulled through the Johnson County building department, warranty registered.
- Verified startup — superheat, subcooling, and airflow checked and documented.
Frequently Asked Questions
- How do you size an AC for my Lenexa home?
- With a Manual J load calculation, not the old unit’s size or a square-footage rule. In Lenexa that matters because a new west-side build and a historic Old Town home carry very different loads. Right-sizing lets the system run long enough to pull humidity out instead of short-cycling.
- I have a newer west-Lenexa home — why does sizing matter so much?
- Because tight, well-insulated newer homes carry a lower cooling load than their size implies. Size by square footage and you oversize the AC, which short-cycles, never running long enough to dehumidify, so the house feels cool and clammy. A Manual J calculation prevents that — and it’s the most common sizing mistake we correct in newer Lenexa homes.
- My larger Lenexa home has a hot upstairs — can a new AC fix that?
- A correctly sized system helps, but if heat rises and the second floor runs hot, zoning is often the real fix — independent control for upstairs and down from one system. We’ll assess whether your comfort problem is sizing, distribution, or a candidate for zoning, and build that into the plan rather than just swapping the box.
- What refrigerant will my new Lenexa AC use?
- R-454B, the lower-global-warming-potential refrigerant that replaced R-410A in new residential equipment as of the 2025 transition. Installing to the current standard keeps your equipment and parts supply supported for years.
- Do you remove my old unit?
- Yes. We recover the old refrigerant per EPA Section 608, haul away the equipment, and handle disposal as part of the installation, not as an add-on.
Contact 7th Degree Heating and Air
Serving Lenexa and all of eastern Johnson County, including Leawood, Overland Park, Prairie Village, Mission, and Merriam, with 24/7 emergency 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
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)