Does humid Gulf Coast climate change my HVAC scope?
Answered by AskBaily Editorial · Updated
Short answer
Yes. Houston sits in IECC climate zone 2A (warm humid). Latent load (moisture removal) often dominates sensible load during shoulder seasons, so sizing HVAC by sensible tons alone produces systems that run short-cycle and leave 65-70% indoor RH — guaranteeing mold. Houston remodels often add variable-speed compressors, dedicated dehumidification, and careful envelope sealing. Houston Energy Code (IECC 2015 with amendments) is less strict than Dallas 2021 but still requires duct leakage testing.
In detail
Yes. Houston sits in IECC climate zone 2A (warm humid). Latent load (moisture removal) often dominates sensible load during shoulder seasons, so sizing HVAC by sensible tons alone produces systems that run short-cycle and leave 65-70% indoor RH — guaranteeing mold. Houston remodels often add variable-speed compressors, dedicated dehumidification, and careful envelope sealing. Houston Energy Code (IECC 2015 with amendments) is less strict than Dallas 2021 but still requires duct leakage testing.
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