Life Event Guide

ADU HVAC: Heating and Cooling Your Accessory Dwelling Unit

Bay Area ADU boom specific

adu hvac requirementsgranny flat heating coolingbackyard cottage hvacin-law unit air conditioning

What You Need to Know

ADU construction boom, regulations

Mini-split vs extending main system

Typical ADU loads (400-1200 sq ft)

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.