How to Lower Your AC Bills in North Carolina Without Sacrificing Comfort

Thermostat Strategy

The Department of Energy recommends setting your thermostat to 78 degrees when you are home and active. Every degree below 78 increases your cooling costs by approximately 3% to 4%. Setting the thermostat to 72 instead of 78 can add 18% to 24% to your cooling bill.

Use a programmable or smart thermostat to automatically raise the temperature 5 to 7 degrees when you are away. Avoid large setback swings (setting it to 85 while away and dropping to 72 when you return), which force the system to work extremely hard to recover and reduce dehumidification.

Reduce Your Home's Heat Gain

Up to 30% of unwanted heat enters your home through windows. Close blinds and curtains on south- and west-facing windows during afternoon hours. Exterior shading (awnings, shade trees, solar screens) is even more effective because it blocks heat before it reaches the glass.

Seal air leaks around doors, windows, and penetrations. In a typical Piedmont home, air leaks account for 20% to 30% of cooling costs. Weatherstripping and caulking are inexpensive and provide immediate returns.

Add attic insulation if yours is below R-38. In the Piedmont, attic temperatures can exceed 140 degrees in summer. Every gap in insulation is a pathway for that heat to enter your living space and force your AC to compensate.

System Efficiency

A clean air filter can reduce AC energy consumption by 5% to 15%. A dirty filter forces the blower motor to work harder, which draws more electricity. Check monthly and replace when dirty.

Keep the outdoor condenser unit clean and unobstructed. A dirty condenser coil reduces the system's ability to reject heat, forcing it to run longer. Monthly rinsing during peak season takes five minutes and costs nothing.

Schedule a professional tune-up before cooling season. A properly charged, clean, electrically sound system operates at peak efficiency. Deferred maintenance always costs more in the long run, both in energy waste and in shortened equipment life.

Use Fans Strategically

Ceiling fans create a wind-chill effect that makes you feel 4 to 6 degrees cooler without actually lowering the air temperature. Using fans allows you to raise the thermostat setting by 4 degrees without any loss of comfort, saving roughly 12% to 16% on cooling costs.

Run fans only in occupied rooms. Fans cool people, not rooms. Leaving fans running in empty rooms wastes electricity without any cooling benefit.

Long-Term Upgrades That Pay for Themselves

If your system has a SEER rating below 13, upgrading to a 16 SEER2 or higher system can reduce cooling costs by 30% to 40%. For a Piedmont home spending $250/month on cooling, that is $75 to $100 in monthly savings during peak season.

Duct sealing is one of the highest-ROI improvements you can make. Sealing leaky ductwork in an unconditioned attic can reduce cooling costs by 20% or more. It also improves comfort by delivering more conditioned air to your living spaces.

A whole-home dehumidifier reduces the moisture burden on your AC, allowing it to cycle less while maintaining comfort. Less cycling means lower energy consumption and less wear on the system.

Related Services

• efficiency-focused maintenance plans
• high-efficiency AC installation

Frequently Asked Questions

What is the cheapest temperature to set your AC in NC?

78 degrees is the DOE-recommended balance of comfort and efficiency. Each degree below 78 adds roughly 3-4% to your cooling costs. Using ceiling fans allows you to set the thermostat at 78 and still feel comfortable.

How much should AC cost per month in North Carolina?

A typical Piedmont home spends $150 to $300 per month on cooling during June through August, depending on home size, insulation quality, system efficiency, and thermostat settings. High-efficiency systems and good insulation bring costs toward the lower end.

Talk to a Technician

Call Davidson Heating & Air at 336-357-5583. Serving homes and businesses since 1984.