If you install an oversized HVAC system, you could experience any of the following issues. 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.
Since an oversized AC is too powerful for your home, it will quickly cool your home then shut off, which can raise your energy bills and wear out your AC (from all the starts and stops).
Larger unit may be more efficient (larger condensers generally are), but make sure you don't oversize it. If the unit is oversized it'll cycle more frequently, which is hard on it. Oversized can also cause some issues with humidity if you have any outside air connections.
Central AC Size Based On Your Home's Square Footage
1,400-1,600 square feet: A 24,000 BTUs (2 tons) AC unit is recommended. 1,600-1,800 square feet: Look for an AC unit with 27,000 BTUs (2.25 tons) for effective cooling. 1,800-2,000 square feet: A 30,000 BTUs (2.5 tons) unit is ideal for this square footage.
However, the truth is an oversized system will not do a better job of cooling the house or provide any extra comfort over a properly sized unit. Air conditioner size is calculated in BTU (British Thermal Units) and tons, and measures how much heat the system can remove from the home in one hour.
A unit with too many BTU's, will cool the room fast, but leave the room humid. Too few BTU's will never cool the room down and the unit will run incessantly. To be sure you're making the right decision, call us to get answers about air conditioner sizes and efficiency.
A 3 Ton air conditioner is typically necessary for homes up to 1,500 to 2,500 square feet. Other factors such as climate, home insulation, and number of windows can also influence the right air conditioner size for your home, so be advised that this is just a general example.
When your ducting is oversized, it will struggle to deliver that temperature-controlled air to various areas of your home. In fact, you'll find that your HVAC system has to work much harder to produce enough hot or cold air to get your entire home up to your desired indoor temperature.
An oversized furnace will keep the house warm no matter how cold it gets outside, but it does so at a cost. First, it will probably make the house less comfortable. When the furnace kicks on, some areas may warm up very quickly, so much so that they get uncomfortably warm before the thermostat has even been satisfied.
One of the most used methods is the HVAC duct sizing rule of thumb. In fact, even professional AC contractors might use this method to size the AC ducts in your home. According to this rule, you need to install an air conditioner of one-tonne capacity for every 500 square feet of the floor area of your residence.
If your A/C is oversized, it will pump out cold air at a quicker rate, rapidly lowering the temperature. This may sound like a good thing, but it cuts the A/C cycle short and prevents your home from being cooled properly. If your A/C runs for less than ten minutes at a time, you might have an oversized unit.
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.
But when an oversized unit is in place, it cools far faster and limits the cycle, which causes muggy, damp conditions in many cases due to high humidity. This can also lead to mold formation and a musty, uncomfortable smell.
Homes measuring 1,000-1,500 square feet: You'll need a 2-ton unit, which corresponds to a cooling capacity of 24,000 BTUs per hour. Homes measuring 1,500-2,000 square feet: You'll require a 3-ton unit, equivalent to 36,000 BTUs per hour. Homes measuring 2,000-2,500 square feet: A 4-ton unit is necessary.
3.5 Tons (42,000 BTUs): Suitable for homes ranging from 2,100 to 2,400 square feet. Installation cost ranges from $3,800 to $5,500. 4 Tons (48,000 BTUs): Suitable for homes ranging from 2,400 to 2,700 square feet. Installation cost ranges from $4,000 to $6,000.
For most homeowners: Hot Climates (Texas): A 17-18 SEER unit with a variable-speed compressor provides a great balance of comfort, efficiency, and cost. Milder Climates: A 14-16 SEER unit is often sufficient.
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.
If you purchase an air conditioner with a higher BTU than needed, you will waste a lot of excess energy and the air conditioner will cycle off too quickly. Thus, an air conditioner with a higher BTU will not cool a room faster.
You also don't want to buy a model that's too powerful for a room. Sure, a 12,000-BTU air conditioner will cool a small space (150 square feet or less) quickly. But it might cool it too quickly, preventing it from removing some of the ambient humidity from the room and leaving the room damp.
The largest residential HVACs generally available are 5-ton units (ton here refers to cooling capacity, not the actual weight of the unit). If your house is so large that it would need six tons or more to effectively cool it, then you'll need to install two or more units.
The square footage covered by a 3 ton AC unit depends on multiple variable but accounting for a quick estimate, roughly 1500-1800 square feet.
How much does a new HVAC system cost for a 2,000 sq. ft. home? The costs range from $6,224 to $11,434, depending on the system type and installation requirements. Key factors include system size, type, efficiency, and local labor rates.