I live in a town that is subjected to severe weather for the majority of the year. We get about 6 months of Winter, with temperatures down below zero plus continuous snowfall. During the summertime months, the temperature climbs into the high eighties and the humidity is unbearable. Spring and fall are respectfully wet, cold and windy. There is rarely an occasion to shut down the heating plus cooling systems and simply open the windows. Because I run either the furnace or the air conditioning unit most of the time, the majority of my budget goes to paying energy costs. I’ve gone to some lengths to seal up every hole and crack in the house and prevent energy waste. Along with increasing the level of insulation in the walls, ceilings and attic, I’ve caulked, weatherstripped and installed ceiling fans. I’ve invested in a state-of-the-art forced air furnace plus central cooling system with adaptable-speed technology and zone control. Every year, I have the furnace plus air conditioning unit professionally cleaned and tuned by a licensed HVAC company. Every 5 months, I hire the HVAC company to inspect, wash plus seal the duct system. My efforts have resulted in a tightly sealed and energy efficient thermal envelope. My heated and cooled air is contained within the house, and no outside air is allowed in. While this saves us cash and improves comfort, it’s terrible for indoor air conditions. The same stale, stuffy air is trapped inside and continually circulated by the heating/cooling system. The air is a health threat. To combat this problem, I’ve installed a ventilation plan which brings in fresh, outside air without energy losses.