Understanding Electric Heat in Your Through-the-Wall AC: When to Use and What to Expect

🧊 Introduction: Heating with Your AC?

Many through-the-wall AC units, including the GE 12,000 BTU model, feature built-in electric heat for supplemental warmth during cooler months. But how effective is it, and when should you use it?

Tony says:

"Think of electric heat in your AC like a space heater with your air conditioner’s airflow. It’s for spot heating, not whole-home heating."

This guide covers:

• How electric heat in AC units works

• When to use it effectively

• Energy use and cost considerations

• Limitations and best practices

🔥 How Electric Heat Works in Your AC

Electric heat in through-the-wall ACs uses resistance heating:

• Electric coils heat up as current passes through.

• The unit’s fan blows air over these coils, distributing warm air into the room.

This method is straightforward but less energy-efficient than heat pumps or gas furnaces.

Reference: DOE Home Heating Basics

🌡️ When Should You Use Electric Heat?

✅ Spot heating: For a bedroom, office, or small living space needing extra warmth. ✅ Transitional seasons: In early fall or late spring when the central heat is off but you need light heating. ✅ Supplemental heating: To warm specific areas without heating the whole home. ✅ Emergency heating: If your primary heating system fails.

⚡ Energy Use and Cost Expectations

Electric resistance heating uses significantly more electricity than the cooling mode of your AC:

• Typical heating mode power draw: 3,000–4,000 watts/hour.

• Cooling mode draw: 900–1,500 watts/hour.

Example cost calculation:

• At $0.15/kWh, running electric heat for 4 hours daily: 3,500 watts ÷ 1000 = 3.5 kW 3.5 kW x $0.15 = $0.525/hour $0.525 x 4 = $2.10/day $2.10 x 30 = $63/month for light use.

Key Point: Use sparingly for targeted heating to avoid high energy bills.

Reference: Energy.gov Estimating Appliance Energy Use

🚫 Limitations of Electric Heat in Through-the-Wall ACs

• Not suitable for whole-home heating.

• Less efficient than heat pumps or gas heating.

• Heating effectiveness decreases in very cold rooms due to heat loss.

• May require a dedicated 208/230V circuit to handle higher loads safely.

Tony’s Tip:

"If your room is drafty or poorly insulated, the unit will work harder and cost more to heat. Seal up leaks first."

✅ Best Practices for Using Electric Heat

✅ Seal windows and doors to retain heat. ✅ Use for supplemental heating only. ✅ Combine with ceiling fans on low to circulate warm air. ✅ Set thermostat reasonably (68°F–70°F) to avoid overuse. ✅ Monitor your electric panel to ensure it can handle the load. ✅ Regularly clean filters to ensure efficient airflow during heating.

Reference: Energy Star Heating Tips

🛠️ Maintenance Considerations During Heating Season

✅ Clean filters monthly to prevent airflow restriction. ✅ Inspect electrical connections for signs of wear. ✅ Check the wall sleeve and seals for drafts. ✅ Listen for unusual noises indicating fan or motor issues.

🧊 Alternatives if You Need More Heating Power

If your space requires regular heating beyond what electric heat can efficiently provide:

• Consider a ductless mini-split heat pump for high efficiency.

• Use a central heating system for whole-home warmth.

• Invest in a high-efficiency portable heater for additional support.

Reference: DOE Heat Pump Guide

✅ Conclusion: Use Electric Heat Smartly

Electric heat in your GE 12,000 BTU through-the-wall AC is great for targeted, occasional heating but not for heavy, daily winter heating needs.

Tony’s Reminder:

"Use it when you need a quick warm-up in your room, but don’t expect it to replace your furnace."

In the next topic we will know more about: Noise Levels: How Loud Is a 12,000 BTU Through-the-Wall AC Really?