Please read
HVACrly publishes general information about heating, cooling, ventilation, refrigeration and water heaters. This page explains the limits of that information and how to stay safe.
At a glance
- General information, not professional advice
- Gas, electrical and refrigerant work needs a pro
- Follow manufacturer instructions and local codes
- Calculator results are estimates
General Information Only
Content on HVACrly is provided for educational purposes. Every home, system and installation is different, and we can’t inspect your equipment. Our guides are not a substitute for diagnosis, repair or installation by a licensed professional.
Safety Warning
Leave the building immediately. Don’t use light switches, phones or anything that could create a spark inside. Call your gas utility or 911 from outside.
- Turn off electrical power at the breaker and shut off gas and water before working on any appliance.
- Work involving gas lines, burners, venting, combustion, high voltage or sealed refrigerant circuits should be done by a licensed technician.
- Water heaters can cause scalding and contain pressurised hot water — never cap or plug a temperature & pressure (T&P) relief valve.
- In the US, purchasing and handling most refrigerants requires EPA Section 608 certification.
Codes, Permits & Warranties
Local building codes and permit requirements vary. DIY repairs or non-approved parts may void a manufacturer’s warranty. Always check your equipment manual, warranty terms and local regulations before starting work.
Calculator Results
Our calculators provide estimates based on your inputs and simplified methods. Actual loads, sizing, airflow and energy savings depend on many factors, including insulation, air leakage, climate, ductwork and installation quality.
Accuracy
We check our content against manufacturer documentation and industry sources, but specifications and products change. If you find an error, please let us know.
No Liability
To the fullest extent permitted by law, HVACrly is not responsible for any injury, damage or loss resulting from the use of information on this website. You use the information at your own risk.
No Affiliation
HVACrly is independent and not affiliated with, sponsored by or endorsed by any manufacturer mentioned on the site. Product names and trademarks belong to their respective owners. See our affiliate disclosure.
Not Sure If a Job Is Safe to DIY?
When in doubt, call a licensed technician.