I just finished reading the book Unconformed, by Bryan Orr, from HVAC School. I invested about 5 hours spread over three days and let me...

(This image is courtesy of our friend JD Kelly @student_of_hvac) In this refrigerant flow diagram, we see a simplistic piping arrangement...

(This image is courtesy of our friend JD Kelly @student_of_hvac) This drawing shows how a low voltage wiring circuit can control a high...

Why do older coils seem to last a long time but ones that are only 10 or 15 years old leak? Energy transfer efficiency was not as much of...

The answer is no because the refrigerant rejects heat in the condenser so the pressure and temperature of the refrigerant should lower....

Do you have to do a triple evacuation if you can achieve a deep vacuum by only doing a single evacuation? Remember that the target vacuum...

Can you Measure Negative Superheat on an air conditioner when checking the charge? The Answer is NO! Time to check your gauges and temp...

How do you tell if a TXV lost part of its bulb charge? If you are measuring a correct/high subcooling along with a high superheat and a...

When checking the refrigerant charge of a running HVACR system, remember to attach your refrigerant hose to the vapor port right away....

Make a Quick Free Refrigerant Leak Tester for the Schrader Valve (Valve Core) at the Access Port. Drill an 1/8” hole in the end of an...

Use an additional valve core removal tool in your vacuum setup to valve off and protect the vacuum gauge sensor from oil contamination...