Heating and cooling (HVAC)

Heating, ventilation, and air conditioning keep a home comfortable and its air safe. Equipment choice depends heavily on climate, and most systems need regular service.

Topics

• Furnaces — A furnace heats the home by burning gas or using electric elements, then moving warm air through ducts.
• Air conditioning — Central air conditioning moves heat out of the home with a refrigerant cycle.
• Heat pumps — A heat pump moves heat rather than creating it, so one system can heat and cool.
• Ductwork and airflow — Ductwork distributes conditioned air.

Before you hire

Confirm the contractor holds the license your state or city requires, carries liability and workers' compensation insurance, and pulls permits for work that needs them. Get written estimates that spell out materials, labor, and warranties.

References

1. 2024 International Mechanical Code, International Code Council

Draft. Some reference links and cost figures are still being verified.