Why Can’t My New Construction AC Keep the House Cool in Utah Summer?
Many high-volume production builders in Utah — DR Horton, Edge Homes, Flagship Homes, Salisbury Homes, and others building at scale — often undersize the AC relative to what a homeowner actually needs during a real Utah summer. It likely meets code on flow and unit size, but in practice, once Utah gets over 100 degrees, a typical builder-sized AC unit, especially a single unit covering two zones, can struggle to keep up from mid-July through mid-August.
Higher-end builders more often install multiple AC units with multiple zones. On Micah’s own custom-built home, they had four separate AC units — one for a small apartment, one for the basement, one for the main level, one upstairs — and the house could be cooled to any temperature quickly. On his current DR Horton home, if it’s over 100 degrees outside, it’s hard to get the house below 78 indoors, and if the oven’s running during that stretch, the house can hit 80 and won’t fully cool back down until evening.
Micah talked with an HVAC contractor who confirmed this is a common pattern across most Utah home builders, not an isolated issue with one brand. If you’re touring a new construction home in Utah during summer, it’s worth asking directly how the AC is zoned and sized — not just assuming a brand-new system means it’ll keep up.
Full breakdown: New Construction in Utah