There are three different types of electrical diagrams used in HVAC systems: wiring schematics, line diagrams and installation diagrams. Each one has its specific use in relation to the installation or maintenance of an ... More » Home & Garden Heating & Cooling

The most common programmable HVAC wiring systems in homes contains a furnace and an air conditioning unit. In this case, the thermostat wires are color-coded. Typically, common household thermostats only contain five ter... More » Home & Garden Heating & Cooling

Wiring diagrams for HVAC air handlers can be found on an number of online sites, from generic diagrams on Electrical Knowhow, to specific models on the Lennox and Carrier manufacturer sites. Most of the diagrams availabl... More » Home & Garden Heating & Cooling
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Ranco is a Chinese manufacturer of electronic and electromagnetic thermostats for HVAC systems, but also produces thermostats for a wide variety of industrial, transportation and commercial refrigeration applications. Co... More » Home & Garden Heating & Cooling

Beginners can read the basics of HVAC systems on the blog portion of the Central Heating & Air Conditioning website. For those seeking to obtain a more in-depth understanding of how HVAC systems work, Industrial Training... More » Home & Garden Heating & Cooling

HVAC schematics are diagrams describing the detailed functionality of a system. They consist of wiring diagrams for the electrical system and plumbing diagrams for air flow and refrigerant lines. Schematics use various t... More » Home & Garden Home Maintenance Electrical

To read wiring schematics for a Trane brand gas furnace, visit, which is an online directory that contains manuals with schematics diagrams. Diagrams within the Trane manuals have a legend or key that s... More » Home & Garden Heating & Cooling