Quick Answer

AC Running But House Still Hot: Diagnosing the Gap

System seems to work but doesn't achieve comfort

ac on but house still hotair conditioner running not coolingac working but not cold enoughhvac not reaching temperature

What You Need to Know

System running vs system performing

Undersized unit, duct leaks, insulation, thermostat location

What temperature drop is realistic

Bay Area Perspective

This guide is specifically written for Bay Area homeowners. Our unique climate—with its fog belt microclimates, mild winters, and wildfire seasons—creates HVAC challenges that don't exist elsewhere.

Local climate considerations included
Written by technicians who service this area daily
Reflects common Bay Area home types and construction

When to Contact a Professional

While this guide provides helpful information, HVAC systems are complex. If you're uncertain about any diagnosis or repair, it's always safer to consult a professional.