We have just purchased a home that has a Rheem 10 Seer Classic Heat Pump M/N RBEH. We had never even heard of heat pumps until we moved to the east coast in Canada. We have our thermostat set to 70 degrees and when it comes on it puts out hot air until it reaches that temperature then it puts out cold air for 3 to 4 minutes then shuts off. So now the house cools down faster and the heat pump starts the cycle again. Are we doing something wrong? The thermostat is set to heat we just keep it on the daytime setting and the fan doesn't run all the time. Any suggestions?