A healthy HRV helps keep the air fresh in your home all the time. Cleaning and maintaining your heat recovery ventilation system will extend its lifespan and prevent imbalances in air pressure. The following practices are generally recommended for maintenance:.
HRV maintenance is a quick, easy activity that can save a lot of stress, time and money in the future and ensures you have clean fresh air all year. A heat recovery ventilator is a smart and energy efficient solution to your home ventilation needs. With the use of an HRV in your home, you can live comfortably and enjoy fresh air year-round with minimal maintenance. Our Showhomes Are Open. Why Morrison. Quick Possessions all Immediate Next 60 Days. The Morrison Experience.
Menu Search. The result is stale, often unhealthy, air. Even on those days that the weather does cooperate, the source quality of incoming air is poor when we rely on the old way of ventilating. A recent Washington State University study showed that forty percent of all indoor air in existing homes originates in crawlspaces and unconditioned basements. But this unbalanced ventilation approach still results in poor source quality, with indoor air being sucked through crawlspaces, basements, and leaks in walls.
For these reasons, virtually every building built would benefit from a balanced, mechanical, fresh air HRV or ERV system — and the more airtight the building, the better that system will perform. We know where incoming air is coming from: a clean, filtered intake leading directly through the HRV or ERV, delivering healthy fresh air, comfortable interior temperatures, and a smaller carbon footprint. And, local exhaust fans can remove excess moisture in the kitchen, bath and laundry area, but create negative pressure inside the house.
As they pump air out, the resultant vacuum slowly draws air into and through the house structure, bringing with it odors, dust and contaminants. In areas where radon is a problem, the negative pressure may increase radon levels. A better whole-house solution is to create balanced ventilation.
This way, one fan blows the stale, polluted air out of the house while another replaces it with fresh. Of course, if the fresh air is cold, you need to warm it up, and that costs money. A heat-recovery ventilator HRV is similar to a balanced ventilation system, except it uses the heat in the outgoing stale air to warm up the fresh air.
A typical unit features two fans—one to take out household air and the other to bring in fresh air. What makes an HRV unique is the heat-exchange core. The core transfers heat from the outgoing stream to the incoming stream in the same way that the radiator in your car transfers heat from the engine's coolant to the outside air. It's composed of a series of narrow alternating passages through which incoming and outgoing airstreams flow.
As the streams move through, heat is transferred from the warm side of each passage to the cold, while the airstreams never mix. Depending on the model, HRVs can recover up to 85 percent of the heat in the outgoing airstream, making these ventilators a lot easier on your budget than opening a few windows.
And, an HRV contains filters that keep particulates such as pollen or dust from entering the house. You will, though, find your energy bill going up slightly to pay for replacing the heat that isn't recovered. Although an HRV can be effective in the summer months, when it will take heat from incoming fresh air and transfer it to stale air-conditioned exhaust air, it's most popular in colder climates during the winter.
To handle this, a damper closes off the cold airstream and routes warm air through the core. After several minutes, a timer opens the fresh-air port and ventilation continues. A typical HRV for residential use might move as much as cfm of air, but the fan speed can be set to suit the air quality in the home.
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