Written by working HVAC techs
Fix it right.
Buy the right tool once.
Troubleshooting guides and honest tool reviews from more than 20 years in commercial HVAC and refrigeration.
WHAT'S ON THE SITE
Troubleshooting guides
498
Tool reviews
416
Videos
319
Products in the shop
2,339
Start with the problem
Pick what you’re dealing with and go straight to the guides for it.
498 GUIDES
System troubleshooting
Not cooling, short cycling, strange noises and what to check first.
299 GUIDES
Thermostats
Wiring, setup, and picking one that works with your system.
276 GUIDES
Ductless mini-splits
Sizing, install questions, error codes and upkeep.
184 GUIDES
AC capacitors
How to spot a bad one, read the ratings and replace it safely.
960 GUIDES
Air filters
Sizes, MERV ratings and how often to change them.
AIR QUALITY
Indoor air quality
Air purifiers and what makes a real difference indoors.
Latest tool reviews
Tools we carry and use, reviewed by model number.
Reviews by brand
Shop parts and equipment
Products we’ve picked out, sorted by what you need.
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Who writes this
Everything here comes from people who do the work, so the advice holds up on a real job.
Mike Izzo
More than 20 years of hands-on commercial HVAC and refrigeration work. [ADD: licenses, specialties]
Steve
[ADD: Steve’s trade background and years in the field]