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Question 1: What do the labels mean and what are the intended destinations for furnace controller board connections marked HS1, FS, IND, M1, M2, & TWIN?

Question 2: Assuming the "M1" & "M2" are...

If the remote is not the problem. A combination of elevated humidity (possibly from a "swamp cooler") and dust (like pet hair) can cause this symptom. I've seen this happen quite a number of times...

I have found that the newer phones that use a power supply that plugs into the wall, can be causing this problem. Try unplugging these types of phones one at a time and see if the problem goes away....

Most automobiles now use R134a which does not require a certification since R134a is a petroleum based refrigerant. Walmart has it on their shelves for anyone to buy.

"Google" ACCA. Air...

Most state and community colleges offer HVAC and exam prep courses for HVAC certification and electrician's licensing. Usually a prerequisite electrician's course is required. HVAC courses typically...

Hello,
My 35 year old compressor finally died so I'm replacing it with a unit I scavenged a while back. I'm 95% sure the "new" unit has no mechanical problems since it was almost new when it was...