Checked package system. 2007 System is a 2 ton straight cool system with a 5 kilowatt heating element. Not a heatpump Heating element is working but thermostat must be set to EM HEAT to operate heat. If thermost is set to heat the cooling will turn on. Filter size 18x24x1 Whenever system is ever replaced main electrical service will need to be upgraded unless the county will grandfather in existing electrical service.