With a house that keeps the heat (and also the air) in, one must ensure a proper exchange of stale house air with fresh air from outside. Indoor air is between 2 to 5 times more polluted than outdoor air - even in downtown Toronto. With increasing rates of asthma caused by pollution, it is important to keep your house air as fresh as possible. Only with a controlled ventilation system, a heat recovery ventilator (HRV), can ensure a continuous supply of fresh air. The HRV brings a constant supply of fresh air into the house, while exhausting stale air. It includes a heat exchanger, which heats the incoming (cold) airstream with the warm, outgoing airstream. Thus 80% of the heat stays in the house even with the constant addition of fresh air. By controlling humidity, HRV's also reduce condensation on walls and windows, prevent mildew and rot, and thus protect the building envelope. Alpha-Tec supplies and installs a wide variety of ventilation equipment including Van EE, Venmar and LifeBreath.

Alpha-Tec can attach additional filters to any forced air system to filter the air from outside as well as the air circulating inside the house. Two technologies can eliminate up to 99% of airborne particulates, dust, allergens and volatile organic compounds (VOC) from urban pollution. The HEPA (high efficiency particulate air) system is commonly used in houses where the occupants suffer from acute forms of asthma and chemical allergies, and TFP (turbulent flow precipitator) units are installed in houses to keep dust levels down and remove pollen and dust from the house air.