Customer called to have a new thermostat installed. Service technician turned off power to system and remove existing thermostat. Installed new honeywell programmable thermostat. Turned power back on and tested heat and air conditioning. Removed dirty air filter. Customer will purchase and install new furnace air filter. Customer very happy with service and thermostat installation. Customer will also purchase preventative maintenance. Will recommend Advanced Heating & Cooling to all of his friends and family.