-Plus Mechanical Services licensed and background checked technicians are proficient at repairing all kinds of HVAC issues. A-Plus Mechanical Services technicians are experts at Air Conditioning Repair, Air Conditioning Replacement, Air Conditioning Installation, AC Repair, AC Replacement, AC Installation, Heating Repair, Heating Replacement, Heating Installation, Air Duct Installation, Residential Cooling and Heating Systems, Air Conditioner Repair and Installation, Furnace Repair and Installation, High-Efficiency A/C and Furnaces, Heat Pump Repair, Digital Thermostats, Electric and Gas Furnaces, Air Filtration, Attic Insulation, Indoor Air Quality, Home Energy Audit and Seasonal Maintenance for all Houston Texas homes.