Cold Climate Heat Pump Capacity
MRCOOL Universal (ducted DIY): Heating Capacity at 5F and Below
The MAX heating capacity the MRCOOL Universal (ducted DIY) holds as it gets cold, from the AHRI-certified NEEP record (AHRI 206735341), with the maintained-% and a balance-point readout.
MAX Capacity by Temperature
| Outdoor temperature | Type | Heating capacity |
|---|---|---|
| 47F | RATED | 24,000 BTU/hr |
| 47F | MAX | 24,000 BTU/hr |
| 17F | MAX | 24,000 BTU/hr |
| 5F | MAX | 22,000 BTU/hr |
| -22F (cold floor) | MAX | 18,800 BTU/hr |
The “will it heat my house at 5F” answer is the MAX at 5F (22,000 BTU/hr), shown next to the rated 47F capacity so you see both. Capacity below -22F is not published for this line, so it is not extrapolated here.
Maintained Capacity at 5F
At 5F the MRCOOL Universal (ducted DIY) holds 22,000 BTU/hr. That is 91.7% of its rated 47F capacity (22,000 / 24,000), and 91.7% of its MAX 47F capacity (22,000 / 24,000). Both are true; the denominator is always stated. NEEP floors its stored percentage to a whole number (91% and 91% respectively); the computed ratio is shown above.
Balance Point & Backup Heat
The balance point is where this model's declining capacity curve crosses the load line, which runs from zero at 65F to your full design load at the design temperature. Enter your own design heat load in the calculator below for your numbers. This is a readout, not a substitute for a Manual-J load calculation.
Run It for Your Temperature and Load
Source
Capacity and COP transcribed from the AHRI-certified NEEP cold-climate air-source heat pump database, pinned to AHRI certificate 206735341 for outdoor unit MDUCO18024036: NEEP ccASHP record, accessed 2026-07-11. The manufacturer engineering data or a Manual-J by an HVAC pro has the final say.
The Universal DIY ducted unit holds its full 24,000 from 47F through 17F, delivers 22,000 at 5F, and is rated to -22F (18,800). Its single multi-size outdoor unit covers 18k through 36k depending on airflow; the certified record here governs the capacity.
Frequently Asked Questions
What is the MRCOOL Universal (ducted DIY) heating capacity at 5F?
The MRCOOL Universal (ducted DIY) puts out 22,000 BTU/hr MAX at 5F, which is 91.7% of its 24,000 BTU/hr rated capacity at 47F (and 91.7% of its 24,000 MAX at 47F). This is the number that answers whether it can heat your house on a cold day. Pinned to AHRI certificate 206735341.
How low can the MRCOOL Universal (ducted DIY) operate?
The lowest rated row on the AHRI-certified NEEP record is -22F, where it still delivers 18,800 BTU/hr MAX. Below that temperature the capacity is held at the -22F row rather than extrapolated to an unpublished colder number.
What is the MRCOOL Universal (ducted DIY) COP at 5F?
The COP at MAX capacity at 5F is 1.8. That is the coefficient of performance at the maximum output the unit reaches at 5F. Only the MAX-capacity COP is published here; the minimum-output COP at extreme lows is artifactual and is not a useful cold-weather figure.
What is the balance point for the MRCOOL Universal (ducted DIY)?
It depends on your home's heat loss. Against a 45,000 BTU/hr design load at 5F, the MRCOOL Universal (ducted DIY) balances at 33F and needs 23,000 BTU/hr (6.74 kW) of backup heat at the 5F design temperature. Enter your own load in the calculator for your balance point. A Manual-J load calculation has the final say.
Other Cold-Climate Heat Pumps
Mitsubishi P-Series Hyper-Heat (ducted)
38,000 BTU/hr at 5F (95% of rated).
Bosch IDS (ducted)
21,800 BTU/hr at 5F (63.7% of rated).
Fujitsu AIRSTAGE XLTH (wall ductless)
23,200 BTU/hr at 5F (96.7% of rated).
Carrier Performance (ducted)
26,200 BTU/hr at 5F (82.4% of rated).
Daikin Aurora (wall ductless)
21,600 BTU/hr at 5F (100% of rated).
LG Ceiling / ducted (R-32)
36,000 BTU/hr at 5F (90% of rated).
Gree FLEXX (ducted, R-32)
25,000 BTU/hr at 5F (100% of rated).
Capacity at 5F Chart (All Models)
Every line on one table: rated 47F, MAX at 17F and 5F, the cold floor, and COP.
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