MULTI3-18HP230C-O

MULTI3-18HP230C-O is in the certified data.

Its certified full-speed heating output at 5°F is 13,500–14,600 Btu/h, 71–77% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

MRCOOL · mini-split heat pump

MULTI3-18HP230C-O is in the certified data as of Sep 19, 2026. MULTI3-18HP230C-O changed its certified heat output at 17°F on 3 pairings in the certified data between August 2025 and September 2026. The new figure is higher on all 3.

18,000 Btu (1.5-ton)
Mini-split
Variable speed
US and Canada

Heating at 47°F

19,000

16,000 at 17°F

14,000 at 5°F

Btu/h, certified

2.30 COP at 5°F

Cooling at 95°F

18,000

Btu/h, certified

EER2 13.0 at 95°F

SEER2 22.55

Heating and cooling by outdoor temperature

Heating output
Cooling output
Median of 1.5-ton mini-split models
Example heating load
Example cooling load
Frosting range, 17 to 45°F

This pairing delivers 19,000 Btu/h of heat at 47°F, 16,000 Btu/h at 17°F, and 14,000 Btu/h at 5°F, 74% of its 47°F rating. It delivers 18,000 Btu/h of cooling at 95°F. At 5°F that matches the example heating load of 14,000 Btu/h; at 95°F it is 11,000 Btu/h above the example cooling load of 7,000 Btu/h.

Each bar is a separate certified test, drawn at its outdoor temperature, starting at zero. The 47°F figure is at normal speed; the 17 and 5°F figures are at full speed. The short dark line on each bar is the median of 1.5-ton mini-split models, one value per model. The shaded 17 to 45°F band is the frosting range: the outdoor coil can frost, and the unit pauses to defrost.

The dashed lines are example loads for a typical area of about 600 sq ft where winters reach 5°F: heating runs from 14,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 7,000 Btu/h at 95°F, at 1,000 sq ft per ton. A house in a hot climate or with large west-facing windows can need twice as much cooling. They are examples, not your building.

Calculate heating and cooling for your house

AHRI certificate 217291694 · listed by MRCOOL · certified May 6, 2026 · 1 pairing carries these values

All rebate programs and their published thresholds

Certified output and power use

Certified output for the selected pairingThe four bars share one scale. The comparison is with the median of 1.5-ton mini-split models. Heating tests run at 70°F indoors. The cooling test runs at 80°F indoors.
Outdoor temperature	Certified outputBtu/h	vs class median	COPat 5°F
5°Ffull speed	14,0004.10 kW	−1%	2.30
17°Ffull speed	16,0004.69 kW	+8%	NR
47°Fnormal speed	19,0005.57 kW	+6%	NR
95°Fcooling, full load	18,0005.28 kW	—	NR

EER2 13.0 in that test. SEER2 22.55 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test: 1.78kW
Electrical input in the 95°F cooling test: 1.38kW
Seasonal average heating COP: 2.90

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 18,000 Btu heat pumps

1.5-ton mini-split models

This pairing at 5°F: 14,000 Btu/h
This unit at 5°F median across its pairings: 14,000 Btu/h
Median of 1.5-ton mini-split models at 5°F: 14,200 Btu/h
Models in this group: 1,110

This unit is above 43% of them, at number 630 of 1,110 by heat at 5°F. The middle half of the group runs 13,000 to 18,000 Btu/h.

This size class is defined by cooling capacity, so cooling is not compared here.

Closest models by heat at 5°F

Every 18,000 Btu (1.5-ton) unit, ranked by cooling efficiency, then heating efficiency

Certified values for MULTI3-18HP230C-O

3 pairings · 3 AHRI certificates

This pairing is the one shown above. Under all pairings, a single figure means every pairing agrees and a range means the pairing decides.

Certified values for MULTI3-18HP230C-O
Heating
	This pairing	All pairings
Heat output at 47°F normal speed	19,000 Btu/h	19,000 Btu/h
Heat output at 17°F full speed	16,000 Btu/h	16,000 Btu/h
Heat output at 5°F full speed	14,000 Btu/h	13,500–14,600 Btu/h
Heat output below 5°F	NR	NR
Cold output 5°F output as a % of the 47°F rating	74%	71–77% of its 47°F rating. Tests use different compressor speeds.
COP at 5°F full speed	2.30	2.30
HSPF2 Region IV	9.9	9.8–10.0
Cooling
Cooling capacity at 95°F full-load test	18,000 Btu/h	18,000 Btu/h
EER2 at 95°F	13.0	12.0–14.0
SEER2 cooling season	22.55	20.0–25.1
Cooling at other temperatures	NR	NR
Equipment and listing
Refrigerant	R-454B
Compressor	Variable speed
Indoor unit	None listed	None
Furnace	No furnace	None
Cold-climate designation EPA's designation, as published	Yes	On every pairing
ENERGY STAR Most Efficient EPA's designation, as published	Yes	On every pairing
Where it is sold	US and Canada	US and Canada
Model string as certified	MULTI3-18HP230C-O

Pairings, by indoor-unit class

3 certified pairings

One row per indoor unit certified with this outdoor unit.

Ductless indoor

None listed (the pairing on screen) MRCOOL 14,000 Btu/hat 5°F, full speed

3 pairings · 47°F 19,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 74% · COP 2.30

Indoor units in the ductless indoor class
Indoor unit	Brand	At 5°FBtu/h · full speed	At 47°FBtu/h · normal speed	At 95°FBtu/h · cooling	Cold output% of 47°F rating	COP 5°Ffull speed	Cold climate	Pairings
None listed (the pairing on screen)	MRCOOL	14,000	19,000	18,000	74%	2.30	Yes	3

The share is heat output at 5°F divided by the 47°F rating.

Sold as, and units with identical certified values

Brands listing this model number

MRCOOL3 pairings

Model number as listed

MULTI3-18HP230C-O 3 pairings

Variants of the same model number

22 units in this group. Basis: identical certified values in the certified data. This grouping is our inference, not a field in the certified data.

21 of 22 shown.

Other model numbers with identical certified values

21 units share this record. Basis: identical certified values in the certified data. This grouping is our inference, not a field in the certified data.

20 of 21 shown.

What affects the price

We don't have prices. These things drive the cost.

The size of the unit, and the indoor equipment on the same certificate.
Whether existing ductwork is reused, altered, or replaced.
The electrical work: a circuit, a disconnect, and sometimes a panel change.
Refrigerant line length and how the outdoor unit is mounted.
Permits and inspection, which vary by municipality.
Removing and disposing of the old equipment.
Local labor rates and how busy the season is.
Rebates and tax credits, which change and have deadlines.

Product history

MULTI3-18HP230C-O changed its certified heat output at 17°F on 3 pairings in the certified data between August 2025 and September 2026. The new figure is higher on all 3.
MULTI3-18HP230C-O first appeared in the certified data between March 2025 and May 2025.

History and definitions

History

First certified record: May 6, 2026
Most recent certified record: May 6, 2026
Measurements reported: May 6, 2026
Status: In the certified data

Field definitions

COP: Heat delivered for each unit of electricity used. A COP of 2.5 gives 2.5 times the heat of an electric baseboard heater.
HSPF2: Heating efficiency over a typical season. Higher uses less electricity.
SEER2: Cooling efficiency over a typical season. Higher uses less electricity.
EER2: Cooling output divided by electrical input in the 95°F full-load test, in Btu/h per watt.
Cold output: Heat output at 5°F as a percentage of the 47°F rating.
% of rating at 17°F: Heat output at 17°F as a percentage of the 47°F rating.

NR not in the certified dataNC not cold-climate certifiedSP single pairing onlyVP varies by pairing; see the pairings tableWD withdrawn since the certified data was last read

Cite or print this page

Heat Pump List, “MULTI3-18HP230C-O — certified heat output”. Certified figures dated Sep 19, 2026, checked daily.
https://heatpumplist.com/model/multi3-18hp230c-o

MULTI3-18HP230C-O

Certified heating and cooling

Heating and cooling by outdoor temperature

Rebates where you live

Certified output and power use#

Power use at each temperature

How it compares with other 18,000 Btu heat pumps#