Heating, ventilation and air conditioning (HVAC) spare parts are components of an HVAC system that must be replaced as a result of normal wear and tear or damage. The most common HVAC spare parts include thermostats, switches, motors, capacitors, compressors and fans. While the exact type of HVAC spare part needed for a particular installation will vary depending on the specific application, all must be able to meet the requirements of the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE). Investing in high-quality HVAC spare parts is essential for ensuring optimal performance and reliability. Not only that, but using outdated or incompatible components can lead to decreased efficiency, reduced energy savings and even dangerous conditions.