A portfolio of IAQ accessories has been introduced for integration with the Greensource line of residential geothermal heat pumps or other compatible HVAC systems, including split-system air conditioners, heat pumps, gas furnaces, or dual-fuel/hybrid equipment. The Total Comfort Control System includes a humidifier, fresh-air dampers, photo-catalytic oxidizer (PCO), high-performance carbon and potassium-permanganate filters, and digital touchscreen thermostats. The Bosch Smoke Detector automatically shuts down heating and air conditioning equipment if fire should start in the home, thereby helping to stop the spread of toxic smoke and providing valuable time to evacuate. The fresh-air dampers have variable control to personalize the amount of outside air entering a home. The thermostats offer touchscreen control and take the guesswork out of when to perform maintenance on the IAQ accessories and heating and cooling equipment. The Greensource CDi series SM model geothermal heat pump communicates alerts and operational details to the thermostat, thus enhancing performance and consumer awareness of conditions throughout the entire home comfort system.