> For the complete documentation index, see [llms.txt](https://lofty-2.gitbook.io/faqs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lofty-2.gitbook.io/faqs/glossary/hvac.md).

# HVAC

Heating, Ventilating, and Air Conditioning (HVAC) systems are used to heat and cool a house. Sometimes HVAC units have integrated heating and cooling systems, while other times the HVAC system of a rental property may consist of an air conditioning unit and a separate furnace unit.