Purchasing a brand new furnace is a serious decision these days because there are so many options, including different brands, models, and variations, technical capabilities, furnace types, and efficiency ratings. However, one of the most important factors to consider when choosing a new furnace is the size that is best suitable for your home in Toronto.
A Building Permit from Toronto Town Hall is usually not required for furnace replacement if no building alterations are taking place.
Installing a properly sized furnace requires more than simply calculating your home’s square footage. There are various aspects to consider while sizing a new gas furnace. Now we’ll go over what those factors are, why properly sizing a furnace is so important, and how to find a furnace that’s the right size for your location, environment, and comfort needs.
The goal of this article is to guide you in choosing the required size of furnace for your heating needs. It is calculated by taking the required heating BTU per square foot for most homes and your climate zone. Our heating BTU calculator takes these critical things into consideration, allowing you to give an answer for common questions as “how many BTUs to heat a home?” or “What size furnace do I need?”
Why choosing the best Furnace Size Is So Important?
While it may be appealing to choose a smaller furnace to save money on the purchase or a larger furnace to increase space-heating, we should follow the Golden Mean rule with furnaces, just as we should with many aspects in our lives: you need one that is just right for your home.
A furnace which is far too powerful will cycle irregularly. This is problematic because it will generate hot and cold zones around the house, decrease efficiency, require additional maintenance, and shorten the life of the furnace.
An undersized furnace will operate non-stop and won’t keep the temperature in your home at comfortable levels. The additional workload will also increase your energy bills, inrease the probability of maintenance issues, and also shorten the lifespan of your heating unit.
Another drawback of having a furnace that is the incorrectly sized is that it will reduce the overall efficiency of your heating system.
The AFUE (Annual Fuel Utilization Efficiency) is the thermal efficiency measurement of a furnace based on normal operation. The AFUE tries to represent the equipment’s actual, season-long average efficiency, taking into account all operating factors.
You won’t be able to get the efficiency rating you paid for if your furnace runs continuously or irregularly because it is the wrong size. That means more energy use and higher heating expenses.
Your furnace must be correctly sized for your home in order to perform at the efficiency level it is rated for.
How many BTU do I need for my house in Toronto?
That is a crucial question that must be answered correctly. On the coldest winter days, a furnace that is way too undersized will not heat your home properly. Areas further away from the furnace may become uncomfortably cold in your home.
An oversized furnace will waste large amounts of energy, and create hot patches around vents close to the furnace before the heating cycle stops.
When you talk about furnace size, you are not talking about the actual physical dimensions of the unit. Rather, the size of a furnace is determined by its heating output and the amount of heat it can provide.
The output of a furnace is often measured in British thermal units (BTU) per hour. A BTU is a unit of measurement for energy, particularly the amount of energy necessary to raise the temperature of one pound of water by one degree Fahrenheit. Heat is now understood to be the same as energy. The joule (J) is the current SI unit for heat and energy; one BTU equals about 1055 J.
You need to remember, that “BTU/h” is sometimes abbreviated to just “BTU”. The modern unit of power for heating and cooling systems is the watt. 1000 BTU/h is approximately 293.1 W.
Some manufacturers have started to calculate furnace size in MBHs rather than BTUs. One MBH is 1000 BTU per hour, then you’re still using the same unit: 60 MBH is equal to 60000 BTU.
The general BTU per square foot heating rule of thumb varies from 30 BTU per square foot to 60 BTU per square foot based on your climate zone. That is a significant variation, with one furnace being twice as powerful as the other, so the size factors are explained here to help you in how to size a new furnace for a house.
A bigger furnace, such as one with an output of 120000 BTU per hour, will provide enough heat for a larger space. A smaller furnace will have a smaller BTU capacity, such as 40000 BTU per hour, and would be suitable for only a smaller pace.
Let’s start with this useful map. The climate becomes progressively colder from zone 1 to 3.
Find your location on the map. If you’re on or close the border between two zones, choose the higher number, the cooler zone.
Take the square footage of your home. If you don’t know it, you can look up the blueprint of the house, or measure rectangles within your home. Multiply the width by length for each rectangle and add them together.
It is not quite accurate, but nevertheless very useful for our purposes. While you shouldn’t use this calculation to make a final decision about furnace size, you can use it to get an idea of the size range to look at when you buy a new furnace. You can get a basic estimate using the square footage of your house.
The general rule of thumb is that you need between 30 and 60 BTU per square foot. Depending on your climate zone, you can determine how many BTU per square foot you need.
Furnace BTU sizing chart
|Square footage||Furnace BTU for
|Furnace BTU for
|Furnace BTU for
|1000||30000 BTU||45000 BTU||60000 BTU|
|1250||37500 BTU||56250 BTU||75000 BTU|
|1500||45000 BTU||67500 BTU||90000 BTU|
|2000||60000 BTU||90000 BTU||120000 BTU|
|2500||75000 BTU||112500 BTU||150000 BTU|
|3000||90000 BTU||135000 BTU||180000 BTU|
Living in Toronto, Ontario (Zone 2), in a home which is 2000 square feet. The chart would tell that you probably need a 90000 BTU furnace.
This value is only a rough approximation to demonstrate how these previously mentioned factors can affect the furnace size you need to buy, how many BTUs needed to heat a house. There are several additional factors that can affect the final furnace sizing calculation.
Professional furnace sizing
The best way to ensure your furnace is the right size for your home is to get an evaluation from a professional HVAC expert at Tankless Pro.
Tankless Pro has been proudly providing professional Furnace Installation services to accurately calculate the square footage of your home, factor in all the other elements that can impact furnace size, and give you a precise BTU capacity for your furnace.