Irregular Temperatures. You'd expect an oversized furnace to produce an excellent heat output. However, when a furnace is too big for a building, it will struggle to maintain the thermostat's settings. Its inefficiency and short cycling will cause the unit to heat the property unevenly.
This is not a good thing and will lead to premature failure of the furnace. Besides premature failure, an oversized furnace will be prone to short-cycling, which is a term that refers to a furnace shutting down before the thermostat has been satisfied.
Too Hot or Too Cold Air
An oversized HVAC unit can make your home's inside temperature uncomfortable. An HVAC system with excess capacity can heat or cool your home faster, but that speed often results in a couple of other issues. First, your home won't benefit from gradual, even heating and cooling.
What would likely be the result of an oversized mid-efficiency furnace? The furnace would operate at a low temperature split.
The more BTUs a furnace has, the larger the area it can heat. However, bigger isn't always better. If your furnace has insufficient BTUs, it'll work non-stop and never keep your home at a comfortable temperature. Alternatively, a furnace with too many BTUs will frequently cycle and be inefficient.
An air conditioner with BTUs that exceed the recommended square footage in your home may also take on more wear and tear over time because it will initiate its on/off cycle more frequently. It could also create a subpar cooling experience because your AC's compressor may turn off much sooner than it should.
Oversized furnaces are very common unfortunately. Not much you can do about it without replacing with a smaller furnace. You can choose your thermostat though, either a bunch of short cycles or have it wait and do one big heat blast every so often.
Because the furnace constantly uses air to burn, it will also draw in cold, dry air from outdoors, which in turn affects your residence's humidity. High-efficiency furnaces, also referred to as a sealed combustion furnace, are better at keeping your humidity even.
An oversized furnace can cause a number of problems, including increased energy costs, shortened furnace life, and uneven heating. If you're not sure what size furnace you need, talk to a heating and cooling professional.
Neither oversizing nor undersizing your AC unit is ideal. Both scenarios can lead to issues with efficiency, comfort, and longevity of the system.
Usually, it is a quick fix, but sometimes the failure can be caused by a much bigger problem. The most expensive part of an AC unit to replace and repair is the air compressor.
If your AC is too big, it will cool down your home too quickly, and the cycle will shut off before the drip pan is full. A less than full drip pan will not drain, which will cause that water to evaporate and recirculate inside your house, making it feel humid.
No, you should not put a bigger blower motor in your furnace.
No matter where you go, you'll hear homeowners raving about their high-efficiency gas furnaces. If you're thinking about replacing your current heating system with a high-efficiency condensing furnace, you'll also need high-efficiency furnace venting.
While it may seem unusual, it's actually quite normal for most furnaces to create some amount of condensation while they are running. If this condensation appears to be more than what you'd consider normal, it could be a simple fix. First, check your condensation drains to make sure they are not blocked.
Furnaces and Boilers
Natural gas furnaces, space heaters and boilers all have gas valves and controls that are especially vulnerable to water damage from floods. Corrosion begins inside the valves and controls, and damage may not be readily visible, even if the outside of the device is clean and dry.
This size of home still needs a large furnace. If you want to evenly heat a 2,000 sq. ft. home, you'll need to look for furnaces rated between 60,000 and 125,000 BTUs, depending on the factors we discussed earlier.
Understanding Excess Air in Furnaces and the Potential Problems It Causes. Too much excess air can reduce your furnace's energy efficiency and introduce more carbon monoxide into the air. Why? When there's too much excess air in the system, it dilutes the water and carbon dioxide during the combustion process.
A furnace blowing cold air could be the result of a leak in your ducting. Over time, the changing temperatures wear on all sorts of things, including your ductwork. In fact, it's rather normal for ductwork to develop leaks over time. When ductwork has a leak, cold air will enter a duct and blow into your home.
Even a slightly undersized furnace will accomplish the job the majority of the time. Taking things down a few sizes will more than likely solve some of your common heating problems like too high of a utility bill while half of your house is blazing and the other half is an icebox.
To heat a 40×60 shop, which is 2400 square feet, you'll typically need between 108,000 and 132,000 BTUs.