The easiest way to tell if you have a Heat Pump is to look at your thermostat and look at the options you have. If your thermostat  has a switch for Auxiallary Heat or Emergency (Back-up) Heat you more than likely have a Heat Pump installed in your home or business. The next way to determine if you a Heat Pump is to set your thermostat to Heat and walk to your outiside unit. If your outside unit is running with the thermostat set to Heat you have a Heat Pump. If you switch the thermostat to Aux or Emergency Heat the outdoor unit should power off and the back-up heat will begin to work and you should  feel warm air coming from your vents.   These are just some basic steps to review the type of HVAC system you may have and is not infallable, but it can steer you in the right direction. To be sure always contact an HVAC Contractor /Professional. Heat Pumps are very energy efficient and have proven to be a reliable piece of HVAC Equipment. If you understand the basic functions of your Heat Pump it will reduce the energy cost of heating your home or business and it will provide you with many years of service. Call A.I.R. at 405-618-2247 if you need assistance with any of your Heating System needs or need a Free estimate for replacing or repairing your Heating System.   Thank You for the Blessing of considering A.I.R. for your HVAC needs!