Go to Heating Help homepage
Go to Heating Help homepage

The #1 Online Resource for HVAC Answers

Find the answers to ALL your questions about HVAC systems, both old and new!

Heating Resources

Browse our resource library on heating systems.

Find Answers

Join the Conversation

Jump in a conversation or post your questions on The Wall.

Ask a Question

Find a Contractor

Looking for a heating professional near you?

Get Started

Systems Help Center

View all
A/C and Heat Pumps
Geothermal
Heating Museum
Hot-Water Heating
HVAC Thermostats and Controls
Solar
Steam Heating
The HVAC Business
Warm Air

The Wall (The Forum)

Join the Forum
Does cast iron boiler efficiency decrease over time?
by Shahrdad at 5:42 pm on 2/14/2021
some people will do anything to keep from fixing the problem
by ratio at 3:44 pm on 2/25/2026
Caleffi 280 Thermostatic Mixing Valve
by EricPeterson at 2:17 am on 8/21/2023
oil boiler loud drone when firing
by epmiller at 2:51 am on 2/21/2026
Piping /Venting
by gfreynolds at 12:45 am on 2/24/2026
Cracked Heat Exchanger
by 2lefthands at 6:54 pm on 2/25/2026

What's New in the HeatingHelp.com Store

View all

Industry News

View all