Air-conditioning system installation and repair; Heating contractor services; HVAC contractor services; Installation, maintenance and repair of faucets, toilets, frozen pipes, sump pumps, and water heaters; Installation, maintenance and repair of humidifiers and dehumidifiers; Maintenance and/or repair of heat pumps; Plumbing contractor services; Air duct cleaning services; Installation and repair of showers; Installation and replacement service for water heaters; Installation, maintenance and repair of air purifying apparatus; Installation, maintenance and repair of cooling and air-conditioning systems for temperature-controlled environments; Provision of information relating to the repair and maintenance of furnaces; Repair or maintenance of boilers; Repair or maintenance of gas water heaters; Repair or maintenance of industrial furnaces