Installing a window air conditioner might seem simple, but a few common mistakes can cost you efficiency, money, or even safety. Here are the window air conditioner, along with tips for a perfect setup.

Mistake #1: Choosing the Wrong Size

Getting a unit that’s too powerful or too weak for your space can cause cooling problems and increase energy costs.

• ✅ Fix: Use a BTU chart to match the unit to your room size (plus extra for high ceilings or sun exposure).

Mistake #2: Skipping the Support Bracket

Many people skip the support bracket to save time or money, but this can lead to sagging units, improper drainage, or even window damage.

• ✅ Fix: Always use a bracket if the unit is heavy (especially 10,000+ BTUs).

Mistake #3: Poor Sealing Around the Unit

If the sides or top of your unit are loosely sealed, hot air will seep in and cool air will leak out—defeating the purpose of having an AC.

• ✅ Fix: Use foam sealing strips or weather stripping to insulate the edges properly.

Mistake #4: Angling the Unit Incorrectly

Window ACs need a slight downward tilt toward the outside to allow condensation to drain properly.

• ✅ Fix: Make sure the unit isn’t completely level. A small tilt (about half an inch) is ideal.

Mistake #5: Blocking Airflow

Placing furniture too close to the unit or installing it in a cramped window can block airflow, making the AC work harder.

• ✅ Fix: Leave plenty of clearance around the unit both inside and outside the window.

Mistake #6: Neglecting Maintenance

Once installed, it’s easy to forget your AC is there—until something goes wrong.

• ✅ Fix: Clean the filter every few weeks, and check for dust, leaks, or noise regularly.