* Heating* Air Conditioning* Refrigeration* Geothermal. Regular AC maintenance is important to keep you air conditioning and heating system operating safely and efficiently. Your HVAC system should be checked twice annually,once before the heating season and once before the cooling season. This helps you avoid costly A/C and Furnace repairs by catching any potential issues before they become expensive problems. Heating and cooling services from McKeon Mechanical offers two residential maintenance service agreements to save you money on your yearly maintenance as well as any repairs and replacements.