Start with conditions, not a product
Long attic duct runs, sealed with tape that's failed years ago, waste capacity before the air ever reaches a room — sealing and balancing often does more than a bigger unit would.
Build a complete scope
- A load calculation for this house, not a swap of the existing tonnage
- Duct condition and leakage in unconditioned attic space
- How upper and lower floors are zoned, which drives most comfort complaints
- Humidity control, since oversizing satisfies temperature and not moisture
- Electrical work, permits, commissioning readings, and warranty registration
Cary context
Many Cary subdivisions route ductwork through hot, unconditioned attics, which is exactly where summer heat gain and leakage do the most damage to comfort and efficiency.