Carrier Infinity 24 / 26 Greenspeed Intelligence Heat Pump + Solar Battery Review
Carrier's flagship Infinity 24 and 26 with Greenspeed Intelligence pairs a variable-speed compressor stepping in 1% increments (between 25% and 100% capacity) with the Infinity System Control—offering built-in kWh energy tracking, quiet 51 dBA operation, and native auxiliary heat lockout for solar battery preservation.
Key Thermodynamic & Solar Sizing Takeaways
- ✓1% increment modulation (25% to 100% capacity) keeps indoor humidity below 45% in summer while drawing under 900W during shoulder hours.
- ✓Built-in Energy Tracking inside the Carrier Infinity System Control estimates real-time and historical kWh consumed by the outdoor heat pump, indoor fan, and electric strip stages.
- ✓Electric Heat Lockout setting allows locking out Stage 1/2/3 electric resistance heat strips whenever outdoor temperature is above your chosen threshold (e.g., 10°F).
- ✓Cold-climate DOE Cold Climate Challenge engineering delivers strong BTU output down to -15°F.
Thermodynamic COP, kW Draw & Solar Array Sizing Matrix
| Operating Condition / Temp | Efficiency / COP | Thermal Output / Rule | Electrical Power | Daily Consumption | Solar PV Sizing |
|---|---|---|---|---|---|
| 47°F Heating | 4.10 COP | 36,000 BTU/hr | 2.57 kW | 17 kWh/day | 4.2 kW DC |
| 17°F Heating | 2.62 COP | 35,000 BTU/hr | 3.91 kW | 48 kWh/day | 7.8 kW DC |
| 5°F Deep Freeze | 2.05 COP | 33,000 BTU/hr | 4.72 kW | 74 kWh/day | 10.5 kW DC |
48V / HV Solar Battery Startup, Soft-Start & Breaker Wiring Specifications
- Compressor & Inverter Architecture
- Greenspeed Variable-Speed Rotary/Scroll VFD Inverter
- Locked Rotor Amps (LRA) & Soft Start
- <14A VFD Soft Start · Soft Start: No
- Breaker & Conductor Sizing
- 30A–40A 240V Outdoor Breaker + 15A 240V FE4A Air Handler (Plus Separate Breaker if Aux Strip Installed)
- Critical Auxiliary Strip Heat Lockout Rule
- Order the FE4A fan coil with a staged 9kW/10kW heater kit wired on a separate breaker so the blower works on battery while the toaster strips stay isolated.
Solar & Battery Advantages
- +Best-in-class central ducted dehumidification and airflow static-pressure compensation
- +Built-in energy monitoring directly on the wall thermostat screen
- +Ultra-quiet 51 dBA minimum sound rating
Design Watchouts
- −Premium turnkey price ($13,500–$21,000)
- −Requires the proprietary ABCD 4-wire communicating Carrier Infinity System Control thermostat
Frequently Asked Questions
How do I prevent a Carrier Infinity Greenspeed from draining my solar battery with strip heat?
In the Carrier Infinity System Control installer setup menu under 'Electric Heat Lockout', set the lockout temperature to 5°F or 10°F, AND have your electrician land the air handler's blower circuit on your backup panel while landing the 60A strip heat sub-breaker on your unbacked main bus.
Does the Carrier Infinity 24 qualify for the $2,000 IRA tax credit in both North and South regions?
Yes, the 25VNA4 (Infinity 24) meets both CEE North Cold-Climate and CEE South efficiency tiers when paired with the matching FE4A variable-speed fan coil.
Sizing a Solar Array & Home Battery for Your New Heat Pump?
Use our 240V Battery Sizing Calculator and Critical Loads Sizer to model winter compressor draw and smart panel load shedding.