A HVAC (Heating, Ventilation and Air-Conditioning) system or unit is very important as it takes care of all the heating, ventilation and air conditioning requirements of a building. If the air conditioning malfunctions during summer or if the heating is not up to the mark during peak winter, it can cause a lot of problems.
from 411HomeRepair.com https://www.411homerepair.com/diy/hvac-air-conditioning/10350-Are-Annual-Maintenance-Contracts-For-Your-HVAC-Unit-Necessary.html
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