Is It Time for a Bigger AC Unit? Summer Load May Reveal the Truth

During mild spring or fall days, your AC system might seem perfectly adequate. But as the intense summer heat sets in, your comfort—or lack of it—could reveal a hidden issue: your AC unit may simply be too small for your home. If it runs nonstop, struggles to maintain temperature, or leaves some rooms hotter than others, you might be dealing with an undersized system.

An air conditioner that’s too small won’t just underperform—it will also work harder than it should, leading to wear and tear, higher utility bills, and premature breakdowns. While there are many factors that affect AC performance, proper sizing is one of the most important. Here’s how to know if your unit is up to the challenge—or if it’s time to consider an upgrade.

ac too small

Signs Your AC Is Too Small

If you’re noticing these issues, your system may be undersized for your square footage and layout:

  • Long cooling cycles
  • Uneven temperatures in different rooms
  • Rising energy bills during hot months
  • AC can’t reach thermostat setting
  • Constant operation without shutting off

These symptoms often become most noticeable during a heatwave, when the system is pushed to its limit and simply can’t keep up with the demand.

Problems Caused by an Undersized AC Unit

An AC that’s too small for your home doesn’t just mean less comfort—it can lead to more costly problems down the line.

  • Overworked components – Running nonstop increases strain on your compressor, fan, and other key parts.
  • Reduced energy efficiency – Smaller systems use more energy trying (and failing) to cool larger spaces.
  • Shorter system lifespan – The constant operation leads to faster wear, breakdowns, and expensive repairs.
  • Humidity issues – Undersized systems often fail to remove enough humidity, making the home feel sticky.
  • Poor air circulation – You may feel cool spots near vents but hot zones farther away.

If you’ve experienced any of these issues, it’s a good idea to have your current system’s capacity evaluated.

How to Know What Size AC You Really Need

Choosing the right AC size isn’t just about square footage—it depends on many home-specific factors. HVAC professionals use detailed calculations (known as Manual J load calculations) to recommend the correct system size.

These calculations consider insulation levels, number of windows, sun exposure, ceiling height, duct design, and more. A properly sized unit will cool efficiently, save energy, and last longer—especially when summer hits hard.

Schedule a Load Evaluation Today

Don’t let another summer pass with a system that’s not pulling its weight. At Shalom Heating & Air, we offer professional load assessments and system sizing consultations. Whether you need a higher-capacity unit or just smarter upgrades, we’ll help ensure your AC is ready for the heat.

Our goal is to keep your home cool, efficient, and comfortable all season long—with no guesswork involved.

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