Repair guides
Short, plain guides. Learn what to check before you buy, and how to do the job safely.
BASICS · 5 MINHow to find your AC model numberWhere the plate hides on each type of unit, and which line to read.Read guideCAPACITORS · 6 MINWhich capacitor do I need?Read µF and volts off the old one. Learn why 440 V can replace 370 V.Read guideCONTACTORS · 6 MINContactor replacement basicsWhat a contactor does, signs it is worn, and how to swap one safely.Read guideAIR FILTERS · 4 MINHow to size an air filterRead the size on the frame, and why a 16x25x1 is not quite 16 by 25.Read guideFURNACES · 5 MINFlame sensor: clean it or replace it?Signs of a dirty sensor, how to clean it, and when a new one is the better fix.Read guide