HeatingHelp.com
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Dan Holohan's long-running forum and article library on steam and hot-water (hydronic) heating, where heating contractors answer homeowner and trade questions. Readers learn how one-pipe and two-pipe steam, boilers, radiators and near-boiler piping work, and how to troubleshoot them.
More resources on Heating Systems
InspectAPedia Heating Section
A large free reference on residential heating maintained by home inspector Daniel Friedman, with diagnostic articles on furnaces, boilers, heat pumps, oil and gas burners, chimneys and controls. Useful for identifying equipment, understanding common faults and judging when a repair needs a professional.
HVAC School Podcasts and Free Training
Learn air conditioning repair with HVAC School! Free training and podcasts from Bryan Orr to boost your HVAC career.
Heating and Cooling of Buildings
An engineering textbook on building HVAC design: heat transfer through envelopes, psychrometrics, heating and cooling load calculations, energy analysis, and the selection of air, water and refrigeration systems. Readers learn to size heating and cooling equipment and compare system options quantitatively.
U.S. Department of Energy
Official website of the U.S. Department of Energy, covering federal energy policy, the national laboratories, and programs in renewables, nuclear, fossil energy, grid modernization and efficiency. Readers find authoritative explainers, research news, funding opportunities and consumer guidance on home energy use.