When outdoor temperatures drop, heat pumps and mini-split systems can lose efficiency—especially during defrost cycles or extreme cold snaps. The result? Longer recovery times, uneven indoor temperatures, and uncomfortable spaces. The MRCOOL MHK05H Signature Series 5kW Heat Kit is a targeted solution designed to restore fast, dependable heat exactly when your system needs it most.

The Problem

• Heat pumps struggle during freezing or near-freezing conditions

• Defrost cycles temporarily reduce heating output

• Homes and light commercial spaces experience cold spots

• Oversized backup heaters waste energy and raise operating costs

The Solution: MRCOOL MHK05H 5kW Heat Kit

Engineered specifically for MRCOOL Signature Series air handlers, the MHK05H provides controlled auxiliary electric heat that automatically supports your system during high-demand conditions. Instead of overworking the heat pump, this heat strip delivers instant supplemental warmth to maintain comfort and system stability.

Why this solution works

• 5kW capacity ideal for mild-to-moderate cold climates

• Integrated circuit breaker for safe, code-friendly installation

• Automatic operation—engages only when additional heat is required

• Factory-matched design ensures proper airflow and performance

• Compact footprint installs cleanly inside compatible air handlers

Best Use Cases

• Homes in regions with seasonal cold snaps

• Mini-split or ducted systems needing backup heat security

• Comfort-focused upgrades without replacing the full HVAC system

• Installers seeking a manufacturer-approved auxiliary heat option

Pro Tip

Pair the MHK05H with proper thermostat configuration so auxiliary heat activates only under defined temperature thresholds—maximizing comfort while keeping energy costs controlled.

? Get the complete backup heat solution:
MRCOOL MHK05H Signature Series 5kW Heat Kit