r/hvacadvice

271K archived posts · Jan 2016 – Sep 2026

HVAC Advice: Where HVAC Mechanics and Techs can offer advice.

r/hvacadvice

A place for homeowners, renters, tenants, business owners or anyone with a general question about their HVAC system. Please read rules before posting!

Created Jan 4, 2016

148KMembers (last snapshot)

271KArchived posts

Please refer to the long form version of the rules here.

r/HVACadvice exists to offer insight from people who are experienced in the HVAC field. If you are experiencing issues with your Heating, Air Conditioning, Ventilation and Refrigeration system PLEASE call a professional. While the mods do their best to make sure information is accurate, you should ALWAYS take internet advice with a grain of salt.

No advertising is permitted here - as in do not post links to your blog, specific products for sale on other websites, etc.

If you have an electrical question, feel free to ask over at r/askanelectrician !

Please do not crosspost to r/hvac or r/thermostats - pick one sub for your post.

Blacklisted topics:

Disabling safety systems, even for just a minute to test or because you are very cold. Zero tolerance.
DIY asbestos abatement
Untrained work on three phase or electrical voltages higher than 240
Venting refrigerant deliberately or advocating doing so.
Uncertified refrigerant use (using gauges without proper certifications).
Unlicensed or uncertified work on gas appliances directly affecting the flow of gas/exhaust, examples include: gas pressure adjustments, venting, gas pipe work.

An immediate ban will result for anyone giving unsafe or dangerous advice.

Related Subreddits:

r/HVAC (mother and father to us all)
r/hvacporn (for those sweet, sexy mechanical rooms and installs)
r/askanelectrician (for basic electrical questions)
r/ProHVACR (questions about owning or operating a HVAC company)
r/refrigeration (commercial refrigeration stuff)
r/airbalance (for Test, Adjust and Balance professionals)
r/kitchensuppression (for commercial range hood/restaurant fire suppression)
r/airconditioners (window units, wall shakers and all related equipment)
r/construction (for the lols and the hahas)
r/MEP
r/plumbing
r/Electricians
r/electrical
r/renewableenergy
r/workplacesafety

The mod crew is forever on call here.

Spam: If you think your submission was unfairly caught in the spam filter, message us right away using the "message the moderators" option below so we can quickly remedy it. Thanks!

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