Upon arrival customer stated that thermostat was on cool but blowing out hot air. Upon further inspection we noticed the heat pump was calling for cooling but in heating mode. We check thermostat settings and found that the settings were programmed for cool only and not heat pump. This has happened twice now customer stated. We explained that it could be due to intermittent failure of the thermostat or human error. We corrected the settings on the thermostat to be set up for heat pump system. Client also signed up for annual membership. Unit cooling upon depature