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Field Guides

Counter knowledge, written down — the questions techs actually ask, answered the way we'd answer them across the counter.

How to Read a Run Capacitor: MFD, Voltage, and Why 'Close Enough' Isn't

4 min read

R-454B Is Here: What Contractors Need to Know About the New Refrigerant

5 min read

Furnace or Heat Pump in the NC Mountains: Deciding by Elevation

5 min read

Converting Furnaces to Propane: Kits, Orifices, and WNC's Gas Map

4 min read

MERV Ratings Without the Marketing: What to Put in the Return

4 min read

R4 vs. R8 Flex Duct: The Crawlspace Condensation Problem

3 min read

Line-Set Length and Lift: Read the Charge Tables Before You Quote

4 min read

Igniters and Flame Sensors: The Fifteen-Minute Furnace Calls

4 min read

Condensate Done Right: Traps, Pitch, Floats, and the Callback You Never Get

4 min read

The C-Wire Problem: Smart Thermostats on Old Wiring

4 min read