Older McKinney homes vs. new builds
McKinney has a real mix of housing. Pier-and-beam homes near the historic square often have little or no wall insulation and plenty of air leaks around old framing. Newer subdivisions toward Stonebridge Ranch, Craig Ranch and Trinity Falls are tighter, but many were built with blown fiberglass on the attic floor and ductwork running through a superheated attic.
Those two situations call for different fixes. In an older home the priority is usually air sealing and filling open cavities during a remodel. In a newer two-story home it's often moving the thermal boundary to the roof deck so the ducts and air handler sit in conditioned space.
Why McKinney homeowners call
The most common complaint is a hot upstairs. Bonus rooms over garages and rooms under low-pitch roof sections can run several degrees warmer than the rest of the house from June through September. Spray foam at the roofline, plus sealing the garage ceiling and knee walls, targets the cause rather than just adding more AC.
We also hear from people building detached shops, she-sheds and garages on larger lots east of town. Closed-cell foam on metal or framed walls controls condensation and keeps those spaces usable in July and January.
Before you get a McKinney estimate
- Ask whether the quote covers sealing the attic's gable vents and soffits if you're converting to an unvented attic.
- Check whether your HVAC contractor should re-check equipment sizing after the attic is sealed; tighter homes often need less tonnage at replacement time.
- If your home is in an HOA, exterior work isn't usually involved, but a permit may be needed for additions and new construction.
- For older homes near downtown, ask about removing old insulation and debris before spraying.