Hey there! As a supplier of heat recovery units, I often get asked about the recommended size for a small house. It's a crucial question because getting the right size ensures optimal performance, energy savings, and comfort. So, let's dive into this topic and figure out what size heat recovery unit is best for your small abode.
Understanding Heat Recovery Units
First off, let's quickly go over what a heat recovery unit does. These nifty devices are designed to recover heat from the exhaust air in your home and transfer it to the incoming fresh air. This way, you're not wasting all that warm air that would otherwise just go out the window (literally). It's a great way to reduce your heating costs and make your home more energy - efficient.
There are different types of heat recovery units out there. For example, you've got the Air Preheater and Economiser. This type helps pre - heat the incoming air using the heat from the exhaust, making it a cost - effective option for small houses. Then there's the Exhaust Heat Exchanger, which directly exchanges heat between the exhaust and incoming air. And the Vapour Economizer in Boiler is another option, especially useful if your home has a boiler system.
Factors Affecting the Size of a Heat Recovery Unit
Now, determining the right size of a heat recovery unit for a small house isn't as simple as just picking a random number. There are several factors that come into play.
1. House Size
This is an obvious one. The square footage of your house matters a lot. A smaller house will need a smaller heat recovery unit compared to a larger one. For a small house, say around 800 - 1200 square feet, you won't need a massive unit. But if your house is on the larger side of the "small" spectrum, like 1500 - 2000 square feet, you'll need something a bit more powerful.
2. Number of Occupants
The more people living in the house, the more fresh air is needed. Each person exhales carbon dioxide and moisture, and you want to make sure that the heat recovery unit can handle the exchange of stale air for fresh air effectively. A small house with just one or two occupants will have different requirements than a house with four or five people.
3. Insulation
Well - insulated houses lose less heat. If your small house has good insulation, the heat recovery unit doesn't have to work as hard to maintain a comfortable temperature. On the other hand, if your insulation is poor, you'll need a larger unit to make up for the heat loss.
4. Climate
The climate where you live is a big factor. In colder climates, you'll need a heat recovery unit that can recover more heat from the exhaust air to keep your home warm. In warmer climates, the focus might be more on ventilation and removing excess moisture.
Calculating the Size
So, how do you actually calculate the size of the heat recovery unit you need? One common method is to calculate the air changes per hour (ACH).
The ACH is the number of times the entire volume of air in your house is replaced with fresh air in one hour. For a small house, a good ACH is usually between 0.5 and 1.5. To calculate the volume of your house, multiply the length, width, and height of each room and then add them all up.
Let's say you have a small house with a total volume of 10,000 cubic feet. If you want an ACH of 1, you'll need a heat recovery unit that can handle 10,000 cubic feet of air per hour (CFH). But remember, this is a simplified calculation. You also need to consider the factors we talked about earlier, like insulation and climate.
Recommended Sizes for Small Houses
Based on my experience as a supplier, here are some general recommendations:
For a Tiny House (up to 500 square feet)
A heat recovery unit with a capacity of around 100 - 200 CFH should be sufficient. These units are compact and can easily fit into the limited space of a tiny house. They're also energy - efficient, which is great for keeping your utility bills low.
For a Small House (500 - 1500 square feet)
You'll probably need a unit with a capacity of 200 - 500 CFH. This size can handle the air exchange requirements of a small family living in this size of house. It can effectively recover heat and provide fresh air, even in moderately cold climates.
For a Larger Small House (1500 - 2000 square feet)
A heat recovery unit with a capacity of 500 - 800 CFH is a good choice. This larger capacity is needed to ensure proper ventilation and heat recovery in a house with more space and potentially more occupants.
Benefits of Choosing the Right Size
Picking the right size of a heat recovery unit for your small house comes with a bunch of benefits.
Energy Savings
A properly sized unit won't waste energy by over - working. It'll efficiently recover heat from the exhaust air and transfer it to the incoming air, reducing your heating costs.
Comfort
You'll have a more comfortable living environment. The right size unit will ensure that there's enough fresh air circulation and that the temperature is consistent throughout the house.
Longevity
A heat recovery unit that's not over - sized or under - sized will last longer. It won't be subjected to excessive wear and tear, which means you won't have to replace it as often.
Making the Right Choice
If you're still not sure what size heat recovery unit is right for your small house, don't worry. That's what we're here for! As a supplier, I've got the expertise to help you figure it out. We can take into account all the factors specific to your house, like its layout, insulation, and your local climate.
We offer a wide range of heat recovery units, from the small and compact ones for tiny houses to the more powerful units for larger small houses. Our units are of high quality and come with a warranty, so you can have peace of mind knowing that you're making a good investment.
If you're interested in learning more or want to discuss your specific needs, feel free to reach out. We're always happy to have a chat and help you find the perfect heat recovery unit for your small house. Whether you're building a new home or looking to upgrade your existing one, we've got you covered.
References
ASHRAE Handbook of Fundamentals. American Society of Heating, Refrigerating and Air - Conditioning Engineers.
Building Research Establishment. Guides on Energy Efficiency in Residential Buildings.