Many homeowners assume that bigger is better when it comes to AC units. In reality, using a bigger unit than you actually need can create several problems, from increasing energy costs to causing the unit to wear out faster. On the other hand, an undersized air conditioner may struggle to keep up during Missouri’s hot summer days.
If you’re considering replacing your air conditioner, understanding how HVAC professionals determine the correct size can help you make a smarter investment.
Why AC Size Matters More Than Most People Realize
HVAC systems are typically measured in tons, with most residential units ranging from two to five tons. However, this doesn’t actually refer to the unit’s weight (thankfully!). Instead, it’s a measure of the unit’s cooling capacity.
Larger homes require an AC unit with a larger cooling capacity. With that said, the size of your home isn’t the only factor that determines what AC unit you need; factors like window placement, ceiling height, and home layout are all important to consider, too.
The goal isn’t to install the largest system possible, but rather to find a system that matches your home’s unique cooling needs. When an air conditioner is properly sized, it can maintain consistent indoor temperatures and operate efficiently. When it’s too large or too small for the home it serves, problems arise.
What Happens If Your Air Conditioner Is Too Small?
An undersized air conditioner may struggle to keep your home cool, especially during the summer when temperatures start to climb.
Some common signs of an undersized system include:
- The air conditioner runs almost constantly
- Indoor temperatures never quite reach the thermostat setting
- Certain rooms remain warmer than others
- High energy bills
During Springfield’s hottest days, an undersized unit might run for hours without ever adequately cooling your home. Along with the obvious comfort problems this creates, it can also lead to increased energy costs and a system that wears out faster than it should.
What Happens If Your Air Conditioner Is Too Large?
You might be surprised to learn that an oversized air conditioner can be just as problematic as an undersized one.
A larger system will cool your home very quickly. That may sound like a benefit at first, but it creates an issue known as short cycling.
Short cycling occurs when a system reaches the thermostat setting too rapidly and shuts off before completing a full cooling cycle, which leads to issues such as:
- Uneven temperatures throughout the home
- Increased humidity levels indoors
- Higher energy consumption
- More wear on system components
- Reduced equipment lifespan
Arguably the biggest of these issues is the fact that an oversized system won’t properly control humidity in your home. When a system short cycles, it doesn’t run long enough to keep humidity levels in check, leaving your home feeling cool but still sticky and uncomfortable.
Is Square Footage Enough to Determine AC Size?
Square footage is an important factor to take into account when choosing an AC unit, but it’s only one piece of the puzzle.
That’s the problem with many online calculators designed to estimate AC size—they can give you a rough estimate of what you need based on your home’s size, but they don’t account for the many variables that influence cooling requirements.
Depending on their construction and layout, two homes with identical square footage may require completely different HVAC systems.
Factors That Influence Air Conditioner Sizing
When you work with an HVAC professional like the cooling experts at Jon Wayne Heating & Air, there are several factors aside from square footage alone that they will look at to determine which AC unit size you need:
Insulation Levels
If your home is well-insulated, it will retain conditioned air better. This reduces cooling demands, which in turn reduces the size of the system you need.
Window Placement
Large windows, particularly those facing south or west, can significantly increase heat gain during the summer.
Ceiling Height
The higher the ceilings are in your home, the more air volume it contains. Ultimately, air volume is what determines how much space the unit has to cool, not square footage.
Home Layout
The layout of your home influences how air is distributed. For example, open-concept homes distribute air differently than homes with lots of rooms and hallways.
Ductwork Condition
If your ductwork is clogged or leaking, the AC unit will have to work harder to keep the home cooled. At Jon Wayne, we offer professional duct cleaning services to help homeowners ensure that the efficiency of their AC unit isn’t limited by their ductwork.
Local Climate
How hot it gets during the summer season obviously has a major impact on the size of the AC unit you need. Springfield summers are known for being hot and humid, so homeowners in the area typically need larger systems compared to those who live further north.
Let Us Help You Choose the Right AC Unit for Your Home
The right-sized air conditioner can improve comfort, reduce energy costs, and help your HVAC system last longer. If you’re considering an AC replacement, let the experts at Jon Wayne Heating & Air help you determine the best fit for your home.
Contact us today to schedule an evaluation and learn more about your air conditioning options.
