Finding the right AC size for older homes can be a unique challenge. Many historic or mid-century homes in the St. Louis area were built before modern energy codes existed, meaning they often lack the insulation, window efficiency, and airtight construction of newer builds. As a result, these homes tend to lose cool air more quickly, making it difficult for improperly sized air conditioners to keep them comfortable.
At Galmiche & Sons, we bring over 70 years of HVAC expertise to the St. Louis area. Our team understands the intricacies of older homes and how to size and install air conditioning systems that meet their unique demands. For more tips on proper air conditioner sizing for your home or to schedule an appointment with our heating and air conditioning experts, call our team or contact us online today.
Why AC Sizing Is Critical for Older St. Louis Homes
In well-insulated homes, standard AC sizing formulas based on square footage and occupancy may be sufficient. However, in older homes with leaky windows, minimal wall insulation, and outdated ductwork, these formulas fall short.
Why Poor Insulation Affects AC Size
Poor insulation allows conditioned air to escape and hot outdoor air to seep in. This increases the cooling load, or the amount of cooling power needed to keep your home comfortable. If your AC is too small, it will run constantly without reaching the set temperature. If it’s too large, it may cool the space quickly but fail to remove enough humidity, leaving the air feeling clammy.
A properly sized unit tailored to the specific needs of your older home will:
- Improve overall comfort
- Reduce energy costs
- Prevent air conditioner short cycling
- Extend equipment lifespan
How Galmiche & Sons Determines the Right AC Size for Older Homes
We do not rely on guesswork or one-size-fits-all estimates. Instead, we use industry-standard Manual J load calculations, which consider far more than just square footage.
Factors We Evaluate:
- Level and type of insulation in walls, attic, and floors
- Window types, sizes, and orientation
- Number of floors and layout of the home
- Amount of air leakage and ventilation
- Occupant behavior and appliance heat load
Supplemental Solutions
In some cases, we may recommend energy-efficiency upgrades such as sealing ductwork, adding attic insulation, or replacing drafty windows. These improvements can lower the necessary cooling capacity, allowing you to install a smaller, more efficient system.
St. Louis Climate Considerations
In a region like St. Louis, where summers are hot and humid, older homes are especially vulnerable to temperature swings. Choosing the wrong AC size for an older home can result in poor humidity control and discomfort during peak heat.
Our local experience ensures your system is not only appropriately sized but also designed to perform reliably during the extremes of our Midwest climate.
FAQs of AC Sizing for Older Homes
Can I just get a bigger AC unit to stay comfortable in my old home?
What if I cannot afford major insulation upgrades?
Does ductwork matter when sizing a new system?
Get Expert AC Help for Your Older St. Louis Home
If you live in an older or historic home in the St. Louis area, trust Galmiche & Sons to guide you through the AC sizing process with precision and care. We specialize in helping homeowners find reliable, energy-efficient solutions that work within the limitations of older construction.
Contact Galmiche & Sons today to schedule a comfort consultation or learn more about air conditioning upgrades for older homes. Our expert team is ready to help you stay cool and comfortable all summer long.
