Editorial standards

HVAC Cheat Sheet guides are written by the HVAC Cheat Sheet Team for working technicians, apprentices and the people who train them. Here's how we put them together.

How we write

• Every guide opens with a direct answer, then explains the why and the steps.
• We research each topic against manufacturer documentation, industry training material, standards bodies and government sources, and list our sources at the end of the guide.
• Regulations and refrigerant rules change. Guides on codes and compliance show the date they were last updated, and we revise them when rules change.
• We write our own explanations. We don't copy manuals or code text.

Calculators

Every calculator shows the formula it uses under the tool, and every formula is tested against known values before it goes live.

Technical review

We're adding licensed HVAC technicians as reviewers. Reviewed guides show the reviewer's name and the review date at the top.

Safety

Our guides are a reference, not a substitute for training, the equipment manufacturer's instructions or local code. Gas, high-voltage and refrigerant work is for trained, certified technicians.

Corrections

If something is wrong or out of date, email hello@hvaccheatsheet.com. We fix confirmed errors and update the guide's date.

Who publishes this site

HVAC Cheat Sheet is published by 90 Leads. No manufacturer or distributor pays for placement in our guides.