Homeowners across the U.S. are increasingly considering heat strips for AC units to achieve year-round climate comfort. This guide offers concise, in-depth information about what heat strips are, how they work, their advantages, installation options, costs, maintenance, and more. Uncover whether adding heat strips to your existing air conditioning system is the right solution for your home’s supplemental or primary heating needs.
| Feature | Details |
|---|---|
| Purpose | Supplemental or emergency electric heating for central AC/heat pump systems |
| Typical Output | 5–20 kW (17,000–68,000 BTU/hr) |
| Ideal Use Case | Supplement heat pumps in very cold weather, provide backup heat |
| Installation Type | Retrofit or factory-installed in compatible air handlers |
| Estimated Cost | $200–$1,200 (equipment), plus installation |
| Maintenance Needs | Minimal; inspect at annual HVAC service |
| Key Benefit | Reliable, instant electric heat, no fuel needed |
What Are Heat Strips For AC Units?
Heat strips, also known as electric resistance heating strips, are electrical elements installed in the air handler of an HVAC system. When activated, they generate heat by passing an electric current through metal coils, which then warm the air flowing through the system’s ductwork.
Primarily used with central air conditioning units and heat pumps, these strips convert electricity directly into heat, providing quick and reliable warmth when needed. They are especially common in regions where winters are mild to moderate or where heat pumps occasionally need backup on freezing days.
How Do Heat Strips Work With HVAC Systems?
When a thermostat calls for heat and outdoor temperatures are too cold for a heat pump to operate efficiently, the system switches on the heat strips. The air handler’s blower pulls air over the hot electric coils, and the now-warmed air is pushed through the home’s ducts.
This process makes heat strips a straightforward solution for homes that have no access to natural gas or require supplemental heating without the cost and complexity of a furnace. Heat strips can work alone or assist a heat pump or air conditioner for temporary or emergency heat.
Integration With Heat Pumps
Most commonly, heat strips are installed in heat pump systems where they serve as emergency or auxiliary heat. During extremely cold conditions, a heat pump’s efficiency decreases, and the system automatically signals the heat strips to engage, ensuring indoor comfort regardless of outdoor temperature.
Types Of Heat Strips For AC Units
Heat strips come in a range of sizes and configurations. It’s important to choose the right type and wattage for your specific HVAC system and climate requirements.
- Standard Electric Heat Strips: Found in most central air handlers, ranging from 5 kW to 20 kW. Suited for most residential and light commercial applications.
- Custom Or Modular Strips: Designed for large air handlers or commercial settings; can be installed in series for higher capacity needs.
- Pre-Installed vs. Retrofit: Some air handlers arrive with factory-installed heat strips. Others allow for retrofit installation if a homeowner wants to add this feature later.
Applications And Advantages Of Heat Strips
Heat strips are essential components for supplemental or backup heating in ducted HVAC systems. Key applications include:
- Backup Heating With Heat Pumps: Heat strips ensure reliable warmth when heat pump output alone is insufficient.
- Primary Heating Solution: In warm southern regions, electric strips can provide the sole source of heat due to infrequent need and low installation cost.
- Emergency Heat: If a gas furnace or heat pump fails, electric strips provide consistent emergency heating.
Advantages include:
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- Immediate Warmth: Heat strips offer almost instant heat output at the flip of a switch.
- No Fuel Storage: Unlike oil or propane furnaces, only electric power is needed.
- Simplicity: Fewer moving parts mean fewer maintenance needs and longer system life.
- Space Saving: No separate furnace needed—just a compact, integrated heating solution.
When Should You Consider Heat Strips For Your AC Unit?
- No Gas Supply: Ideal for homes without natural gas lines or fuel storage.
- Mild Winters: Regions with occasional cold snaps benefit from supplemental or emergency electric heat.
- Heat Pump Owners: Enhances comfort and security during ice storms or extremely cold spells.
- Renovations And Retrofits: Easily added to compatible systems to upgrade heating capabilities.
Keep in mind: In very cold climates or where electric rates are high, full-time reliance on heat strips for primary heating can be costly compared to alternatives like gas furnaces or modern heat pumps.
How To Select The Right Heat Strip Size And Capacity
Proper sizing ensures maximum performance and safety. The required wattage output is based on your home’s size, insulation, and local climate zone.
| Home Size (sq ft) | Recommended Heat Strip Size |
|---|---|
| Up to 1,000 | 5–8 kW |
| 1,000–1,500 | 8–10 kW |
| 1,500–2,000 | 10–15 kW |
| 2,000–2,500 | 15–20 kW |
Consult with a professional HVAC technician to assess your specific heating needs. Oversizing can trip breakers or cause inefficient cycling, while undersizing may fail to provide enough heat.
Installation: Can You Add Heat Strips To Existing AC Units?
Most modern air handlers can accommodate heat strips if the unit is compatible, but older systems may require upgrades.
- Factory-Ready Air Handlers: Many AC units/heat pumps are prewired for heat strips. Adding a kit is straightforward for a licensed technician.
- Retrofit Installation: If your air handler has space and the necessary controls, compatible strips and wiring can be installed as an aftermarket upgrade.
- Electrical Requirements: Adding heat strips often requires upgrading circuit breakers or wiring. Proper voltage and safety shutdowns are essential.
Professional installation is required, as working with high-voltage circuits and HVAC control boards involves safety and code compliance issues.
Cost Of Heat Strips For AC Units
Heat strip prices depend on capacity, brand, and whether they’re purchased as part of a new system or as an add-on. Expect to pay:
- 5–10 kW strips: $200–$400
- 15–20 kW strips: $400–$1,200
- Installation labor: $300–$1,000 (varies based on existing electrical setup)
Total installed cost generally ranges from $500 to $2,000. Additional expenses may apply for complex rewiring or panel upgrades.
Cost Comparison With Other Heating Options
| Heating Type | Equipment Cost | Installation Cost | Operating Cost* |
|---|---|---|---|
| Heat Strips (Electric) | Low | Low | High |
| Gas Furnace | Moderate | Moderate | Low to Moderate |
| High-Efficiency Heat Pump | High | High | Very Low |
*Operating cost per BTU delivered; varies by local electricity or fuel rates.
Energy Efficiency And Cost Of Operation
Electric resistance heating is 100% efficient at converting electricity to heat at the point of use, but compared to heat pumps or gas furnaces, the cost per BTU is much higher—especially in regions with high electricity rates.
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- For every kWh consumed, you get 3,412 BTUs of heat.
- Heat pumps can deliver 2–4 times as much heat per kWh thanks to their refrigeration cycle.
Relying on heat strips regularly for primary heating can quickly raise utility bills. Most American households use heat strips only as supplemental or backup heat to manage operating costs.
Maintenance Of Heat Strips In AC Units
Heat strips require minimal maintenance. Basic care includes:
- Inspect during annual HVAC service for signs of electrical wear or corrosion.
- Keep air filters clean to prevent overheating.
- Check connections and circuit breakers to ensure safe operation.
Since heat strips have no moving parts, they rarely fail unless there is an electrical issue or dust buildup causing overheating. Professional inspections ensure continued safe function.
Common Signs Of Heat Strip Problems
Watch for these signs that your heat strips may need attention:
- AC unit blowing cold air when set to heat
- Tripped breakers or “burning” smells
- Unit fails to reach set temperature during cold spells
- Heat pump switches to emergency mode more frequently than expected
If any of these symptoms occur, turn off the system and have it professionally inspected to prevent further damage or fire risk.
Are Heat Strips Safe In Modern Homes?
Yes, heat strips are safe when professionally installed and paired with modern control boards and safety shutoffs. Built-in temperature limit switches prevent overheating. However, they draw substantial electrical current, so a licensed HVAC technician must install them to meet NEC (National Electrical Code) and local requirements.
Can Heat Strips Replace A Furnace?
In warm climates or small homes, heat strips can often meet most or all heating requirements. However, due to high electricity consumption, they are usually not practical as the main heating source for larger homes or in very cold climates. Instead, they serve as backup for heat pumps or as an easily managed solution where heating demand is low and infrequent.
Smart Thermostats And Heat Strip Control
Modern thermostats and control boards optimize when and how heat strips are used. For example, a smart thermostat will:
- Only call for auxiliary heat when the heat pump alone can’t reach set temperature quickly enough
- Coordinate with sensors to manage energy bills and avoid waste
- Provide utility usage insights and remote management for homeowners
If upgrading, select a thermostat labeled as “heat pump compatible with auxiliary/emergency heat control.”
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Frequently Asked Questions About Heat Strips For AC Units
Do Heat Strips Work With All Air Conditioners?
Not all air handlers or AC units can accept heat strips. Check the make/model or consult an HVAC professional to determine compatibility.
How Long Do Heat Strips Last?
With proper installation and minimal maintenance, heat strips can last 10–20 years—often as long as the air handler itself.
Can I Install Heat Strips Myself?
No—working with high-voltage components is dangerous and may void warranties. Always use a licensed heating contractor.
Can I Retrofit Heat Strips To An Older System?
Sometimes, if the air handler allows and electrical service is sufficient, but in many older homes, a full system upgrade is more practical.
Pros And Cons Of Electric Heat Strips In AC Units
| Pros | Cons |
|---|---|
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Choosing The Best Heat Strips: Brands And Considerations
- Top brands include Goodman, Trane, Lennox, Carrier, Rheem, Bryant, and York.
- Look for OEM (original equipment manufacturer) compatibility for your air handler or heat pump.
- Choose factory kits with preset safeties and wiring for reliability.
- Check warranty terms—many new systems cover installed strips for 5–10 years.
Environmental Considerations And Regional Suitability
Electric heating’s carbon footprint depends on your local electricity source. Areas relying on coal-fired plants may have higher emissions, while those using hydro, wind, or solar enjoy much lower environmental impact. Consult with your regional utility for green power options if eco-friendliness is a concern.
Heat strips remain an excellent choice in the southern and coastal United States, where heating is rarely needed but instant, reliable backup is valuable.
Summary: When Are Heat Strips Right For Your AC Unit?
Heat strips for AC units provide affordable, reliable, and instant electric heating as part of a central air handler system. They’re best used for backup, emergency, or occasional primary heating in milder climates or homes lacking gas service. Installation and sizing must be handled by professionals to ensure safety and efficiency. For those seeking seamless comfort through all seasons, heat strips offer a practical solution—particularly when paired with modern heat pump systems and smart controls.
Consult a licensed HVAC expert to assess if heat strips are the best supplemental or emergency heating option for your residence, factoring in your climate, home size, budget, and energy preferences.