HVAC Capacitor: What about it?

Danny Huffman — Fri, 16 Jan 2026 20:57:56 +0000

An HVAC capacitor is an important component with one mission: store and release electrical energy to give motors (like the condenser fan and blower fan) the jolt needed to start and keep running smoothly. Two common capacitor types are start capacitors (for initial power) and run capacitors (for continuous operation).

HVAC Capacitor Function and Failure

Like anything else, capacitors do not last forever. Signs of failure including humming, failure to start, or short. Having a bad capacitor also causes the air conditioner system to not operate or not operate the way it was meant to. For example, if the outdoor cfm capacitor goes bad, the cfm will not operate, resulting in blowing warm air instead of cool air. Being in Florida, hot air during the summer months is not a positive experience.

Today we reviewed capacitor basics, testing, and taking first steps on an exciting journey.

Next week we will be deep diving on the refrigeration cycle as well as getting our hands on stepping into diagnostics and troubleshooting… oh what fun!

If you enjoy daily challenges, working with your hands, and never a dull moment, the HVAC industry may be a good fit for you and HVAC Technical Academy can get you there in under two months.

Danny

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Nghi Thoi – HVAC Training Video | Sanford Workshop Sept 2025

Thomas Vaughn — Tue, 21 Oct 2025 16:15:53 +0000

Workshop Status:

Completed

EPA Certification:

Universal

Employment Status:

Nghi Thoi at HVAC Technical Academy

Nghi Thoi video - Capacitor Replacement (Training Transcript)

Nghi Thoi video transcript - Capacitor Replacement (Training Transcript)

Speaker: Nghi Thoi

[Laughter] Hi, my name is Nghi from HVAC Technical Academy. Today I’m going to show you how to take it out capacitor and replace it. This is capacitor. It show like the rating 35 flash five mean 35 is pressure and five is a fan, be like 5%. This is a dual capacitor be like common fourprong. They got home three prong and the fans run part. Especially do is they energize start and running on compressor and the fan. When they go out, when they go bad, the fan and compressor not going to working.

So, let’s check out how it work. I’m going to check out the harm first. It reading zero, so mean it’s bad for compressor. And we’re taking a fan is it’s come up 4.9; this mean the fan is working.

So here the capacitor are located on condenser. If you want to replace it, just unplug a wire from home compressor and commons and fan. Then you swap it in. You plug back in and they should be energized for all condenser system.

That’s how it works. And that should be it. Thank you for watching. My name is Nghi. So, have a nice day.

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Capacitor Replacement Archives - HVACTA