Cold Climate Performance
Homes in colder climates often require larger auxiliary heat capacity because heat pumps lose efficiency as outdoor temperatures fall
Northern climates may benefit from larger backup heat kits than mild-weather regions.

Send us your indoor unit model number, serial number, and photos of the existing part before ordering. This helps us verify compatibility and reduce the chance of ordering the wrong replacement part.
Introducing the Genuine MRCOOL Electric Heat Strip Kit for the MRCOOL Signature Series Air Handlers—an essential component to elevate your HVAC system's heating performance. Available in a range of capacities, including 5kW, 7.5kW, 10kW, 15kW, and 20kW, this versatile kit is designed to seamlessly integrate with the MRCOOL Signature Series ducted air handler, providing you with the flexibility to choose the right size for your specific heating needs.
Manufactured to order, these heat strips ensure a customized fit for your system. Please note that due to the made-to-order process, there may be a shipping delay of up to 21 days. Rest assured, the wait is well worth it for the reliable performance you'll receive. When you purchase from MRCOOL HVAC Solutions, the USA's most trusted MRCOOL dealer, you can be confident you're getting top-quality products backed by exceptional service.
Key Features:
Why Add a Heat Strip Kit? During the colder months, a heat strip kit is a valuable addition to your HVAC system. It boosts the system's ability to deliver warm air quickly and efficiently, ensuring that your home or business stays comfortable when outdoor temperatures drop. Whether you're relying on it as a primary heat source or as supplemental heating, the MRCOOL Electric Heat Strip Kit provides dependable warmth and peace of mind.
Easy Installation: This heat strip kit is designed for hassle-free installation, allowing homeowners and contractors alike to upgrade their MRCOOL Signature Series air handler with minimal downtime. The kit comes with clear instructions, making it easy to enhance your system’s performance without any major modifications.
Order with Confidence from MRCOOL HVAC Solutions: When you order from MRCOOL HVAC Solutions, you're working with the USA's most trusted MRCOOL dealer. Our commitment to quality, customer service, and fast, reliable shipping ensures you'll get the parts you need to keep your HVAC system running smoothly.
Upgrade your air handler today with a genuine MRCOOL Electric Heat Strip Kit, and enjoy consistent, comfortable heating throughout the colder seasons. Trust MRCOOL to deliver innovative, high-performance HVAC solutions that keep you comfortable all year long!
No confirmed fitment models have been added yet. Verify compatibility before ordering.
| Brand | MRCOOL DIY Direct |
|---|---|
| MRCOOL® Part Number | MHK05H |
No common symptom information has been added for this part type yet.
This replacement part should be installed by a qualified technician or a capable installer familiar with mini split service procedures. Always disconnect power before servicing HVAC equipment.
No Q&A content has been added for this replacement part yet.
HEAT STRIP SIZING & PERFORMANCE
The correct electric heat strip size depends on more than air handler tonnage. Climate, home insulation, electrical capacity, system design, and heating demands all affect which heat kit is appropriate for your HVAC system.
Homes in colder climates often require larger auxiliary heat capacity because heat pumps lose efficiency as outdoor temperatures fall
Northern climates may benefit from larger backup heat kits than mild-weather regions.
Heat strips draw significant electrical current. Your panel capacity, breaker size, and wiring must support the selected heat kit.
Always verify electrical requirements before upgrading to a larger kW heat strip.
Poor insulation increases heat loss and can increase demand on both the heat pump and electric backup heat system.
Improving insulation may reduce heating costs more than increasing heat strip size.
Larger homes generally require more heating capacity, but square footage alone should not determine heat strip selection.
Heat load calculations are more accurate than simple square-foot estimates.
Drafty homes, large entryways, and poorly sealed structures can dramatically increase heating demand.
Air sealing improvements can significantly improve HVAC performance.
Heat strips are not universal. Each air handler has specific approved heat kit sizes and electrical configurations.
Always verify your air handler model number before ordering a heat strip.
Heat strips provide auxiliary and emergency heat when additional heating capacity is needed. Choosing the correct heat kit requires verifying air handler compatibility, electrical requirements, climate conditions, and manufacturer specifications.