Heat strip air condition ers combine standard cooling with electric resistance heating to provide warmth when outdoor temperatures are cold. This article explains how heat strips work, the different types available, efficiency considerations, and practical guidance for use, maintenance, and safety. Understanding these systems helps homeowners decide when a heat strip makes sense and how it compares with heat pumps and other heating options.
How Heat Strips Work
Heat strips are electric heating elements installed in an air conditioner or heat pump system. During cold weather, the thermostat signals the system to switch from cooling to heating, and the resistance elements generate heat as electricity flows through the coils. The warm air is blown through the ducts by the blower, raising indoor temperatures without relying on fossil fuels. This supplemental heat is most common in single-stage and some heat pump configurations, offering a convenient, centralized heating option.
In many systems, the heat strips operate only when the outdoor temperature is too low for efficient operation of the outdoor unit alone. This design helps protect the compressor and maintain comfort, but it can also raise electricity use during colder periods. The control strategy varies by equipment: some systems use two-stage or variable-speed controls to modulate heat strip output and balance comfort with energy use.
Types Of Heat Strips
There are several common types of heat strips based on material and configuration:
- Single-Stage Heat Strips: A fixed amount of heat is produced when heating is needed. Simple and inexpensive, but less precise in maintaining comfortable temperatures.
- Multi-Stage (Two-Stage) Heat Strips: Offer low and high heat output, improving efficiency and comfort by adjusting to changing conditions.
- Electric Resistance Coils: The most common form, typically made of materials that provide consistent electrical resistance and rugged performance.
- Supplementary vs. Primary Heating: In some installations, heat strips are purely auxiliary, used only when heat pump or furnace needs assistance; in others, they provide primary heat when needed, especially in regions with very cold winters.
Key considerations include the total wattage of the strips, the size of the space, and the system’s ability to distribute warm air evenly. Proper sizing is essential to avoid short cycling, uneven heating, or excessive electricity use.
Efficiency And Operating Costs
Heat strips use electricity, which typically makes them less cost-efficient than natural gas, heating oil, or even some heat pump configurations in mild to moderate climates. The overall efficiency depends on the system’s design and the electrical rate. For homes with high electricity costs, relying heavily on heat strips can significantly raise energy bills during winter months.
To maximize efficiency, many installations pair heat strips with a heat pump in a dual-stage or hybrid system. The heat pump handles most of the heating during moderate weather, while heat strips engage only on very cold days or during peak demand periods. This approach can keep comfort high while controlling operating costs.
Homeowners should review the equipment’s Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF) ratings, along with the cost of kilowatt-hours in their area. A professional energy audit can clarify whether heat strips are cost-effective for a given climate and home size.
When To Use A Heat Strip System
Heat strips are typically considered in these scenarios:
- Homes in regions with cold winters where heat pumps alone may struggle to meet comfort needs.
- Existing air conditioning systems that require an upgrade to provide warmth without installing a separate furnace.
- Buildings that prioritize electric heating for safety or fuel availability reasons, such as areas with unreliable gas service.
- Supplementary heating to reduce humidity and provide rapid warm-up in the morning or after long setbacks.
Pros include ease of installation alongside existing AC equipment, rapid warmth, and strong compatibility with modern thermostats. Cons include higher operating costs on electricity and the potential for uneven heat distribution if the ductwork or air handler is undersized.
Maintenance And Safety
Regular maintenance helps heat strips perform reliably and safely. Key tasks include inspecting electrical connections for corrosion or looseness, ensuring adequate airflow across the coils, and replacing air filters to prevent restricted airflow. An HVAC technician should assess the system’s electrical panel, circuit breakers, and wiring to prevent overloads and overheating.
Safety considerations involve proper electrical sizing, proper enclosure for heating elements, and adherence to local electrical codes. Never attempt to service heat strips without turning off power at the breaker panel, as the elements can retain heat and pose burn or shock risks.
Common issues include thermostat malfunctions, degraded insulation around ducts, and heat strip degradation due to cycling or moisture exposure. Early diagnosis by a trained professional helps minimize energy waste and maintain comfort levels.
Alternatives To Heat Strips
Several alternatives may suit different homes and budgets:
- Heat Pumps With Enhanced Cold-Weather Capabilities: Modern heat pumps operate efficiently in lower temperatures and can reduce reliance on electric heat strips.
- Gas Furnaces Or Boilers: Often more cost-effective for long, cold winters due to lower fuel costs in many regions.
- Hybrid Or Dual-Fuel Systems: Combine a heat pump with a furnace to optimize efficiency across seasons.
- Programmable Thermostats And Zoning: Improve comfort and reduce energy use by adjusting temperatures in different zones throughout the day.
Choosing between heat strips and alternatives depends on climate, energy prices, existing infrastructure, and comfort preferences. A professional assessment can help determine the most economical and reliable heating strategy for a given residence.