Determining what size AC you need for your home can be challenging, especially if you don’t know what to look for. However, finding the right size is paramount for experiencing comfort and maximizing cooling efficiency. 

With the assistance of 75 Air HVAC experts in Tampa Bay, Florida, you will be able to find what size AC you need for your home. 

image of Light Commercial HVAC deciding on size AC

Why Is It Important To Find The Right Sized AC?

According to The Department of Energy, an improperly sized AC results in inadequate cooling, greater energy consumption, higher electric bills, and system wear and tear. Specifically, a unit that’s too small for your home requires more power to cool, leading to increased expenses and difficulty achieving the desired temperature.

Similarly, an AC that’s too large will cool the room down faster, and then turn off, having little time to remove excess moisture from the air. This leads to more humidity. In addition, an oversized system will be noisy and potentially lead to mold and poor indoor air quality, while costing too much

Therefore, bigger isn’t always better. Instead, you can use several methods to determine what size system is most appropriate for your home. 

Considering AC Efficiency Ratings

When choosing an AC, it’s important to consider efficiency ratings. 

Before making your selection, evaluate the AC’s efficiency rating, known as SEER.

SEER (Seasonal Energy Efficiency Ratio)

SEER values represent the cooling output of a system divided by its overall power consumption. For instance, by upgrading from a unit with a SEER of 9 to one with SEER 14, you can reduce your energy consumption by about 35%. So, if you are paying $100 dollars a month, your bill will be $35 dollars less. 

The DOE suggests that more efficienct air conditioners use 30 to 50% less energy to produce the same results as ACs in the 1970s.

How To Determine What Size AC You Need For Your Home

British Thermal Units

An AC’s size refers to its cooling capacity, not the unit’s measurements. The capacity is measured in British Thermal Units (BTUs) or British Thermal Units per hour. For example, one ton of air conditioning removes 12,000 BTUs of heat per hour, which means the AC needs 20 BTUs to cool each square foot of living space. 

Calculate room size

Before searching for an AC, measure your home’s square footage by multiplying the length of each room by its width, then adding them together. After, multiply the total square footage by 20 to see how many BTUs are required to cool the space. 

Which Rooms Need Cooling

Your calculations should be based on how many rooms need cooling. If you want 3 out of 5 rooms to have air conditioning, only those spaces should be included in your measurements. 

Make Necessary Adjustments For The Best Size 

Energy Star recommends making several adjustments to find the best size for window units:

For central air conditioning, you can make similar adjustments. If you are uncertain what additional changes you should make, consult an HVAC professional. 

Factors That Affect Size Requirements

Square footage is not the only factor that impacts AC size. 

Here are several other factors that can affect your measurements: 

Since AC size calculations are typically based on 9 foot ceilings (the average for most homes), add 1 or 2 additional BTUs for those that exceed that height. 

Systems in hotter climates run more frequently. So, you’ll need an AC with higher efficiency requirements if you live in a location that’s hot year-round. By doing so, you will save more money.

Any rooms that regularly generate heat, such as the kitchen or laundry room, will be more difficult to keep cool. When making your calculation, add 1 or 2 BTUs to compensate for this. 

Those homes with darker color exterior will absorb more sunlight. This will reduce your cooling capacity. Therefore, select a system with higher SEER ratings. 

Poorly insulated homes will have more air that escapes, which will increase the load on your AC. When deciding on a unit, you may need one that’s bigger to account for this issue. However, it’s preferable to ensure your home is well insulated before installation. This will reduce your monthly HVAC expenses and system wear and tear.

Homes with no shade or that face the sun will absorb more heat, causing more strain on your AC. Windows will also create additional heat in your indoor space. So, select a system with a higher SEER value.

Rely On 75 Air HVAC Professionals For Assistance

Our experts at 75 Air in Tampa Bay, Florida will help you find what size AC is best for your home. Our technicians will calculate your space’s dimensions, and make the best recommendation based on your home and your needs. We further specialize in maintenance, repair, and installation, prioritizing customer satisfaction and reliable service. 

More so, we will assist you with determining what HVAC systems fit your budget and qualifications. 

Contact us today to speak with a customer service agent or to book a FREE quote