5MXTH40AVJU

Daikin · mini-split heat pump

All 89 certified Daikin models

5MXTH40AVJU is in the certified data as of Sep 19, 2026.

42,000 Btu (3.5-ton)
Mini-split
Variable speed
US and Canada

Heating at 47°F

40,500

23,600 at 17°F

34,200 at 5°F

Btu/h, certified

1.85 COP at 5°F

Cooling at 95°F

41,500

Btu/h, certified

EER2 10.1 at 95°F

SEER2 17.95

Heating and cooling by outdoor temperature

Heating output
Cooling output
Median of 3.5-ton mini-split models
Example heating load
Example cooling load
Frosting range, 17 to 45°F

This pairing delivers 40,500 Btu/h of heat at 47°F, 23,600 Btu/h at 17°F, and 34,200 Btu/h at 5°F, 84% of its 47°F rating. It delivers 41,500 Btu/h of cooling at 95°F. At 5°F that is 1,800 Btu/h short of the example heating load of 36,000 Btu/h; at 95°F it is 23,500 Btu/h above the example cooling load of 18,000 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 3.5-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 1,500 sq ft where winters reach 5°F: heating runs from 36,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 18,000 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 218043346 · listed by Daikin · certified Jan 14, 2026 · 1 pairing carries these values

Certified output and power use

Certified output for the selected pairingThe four bars share one scale. The comparison is with the median of 3.5-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	34,20010.02 kW	−5%	1.85
17°Ffull speed	23,6006.92 kW	−26%	NR
47°Fnormal speed	40,50011.87 kW	−8%	NR
95°Fcooling, full load	41,50012.16 kW	—	NR

EER2 10.1 in that test. SEER2 17.95 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test: 5.42kW
Electrical input in the 95°F cooling test: 4.11kW
Seasonal average heating COP: 2.60

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 42,000 Btu heat pumps

3.5-ton mini-split models

This pairing at 5°F: 34,200 Btu/h
This unit at 5°F median across its pairings: 34,200 Btu/h
Median of 3.5-ton mini-split models at 5°F: 36,000 Btu/h
Models in this group: 161

This unit is above 30% of them, at number 113 of 161 by heat at 5°F. The middle half of the group runs 33,000 to 37,000 Btu/h.

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

Among 42,000 Btu mini-split models, each by its median certified pairing, highest first: 5°F output as a share of its 47°F rating, 57th of 161 (tied); HSPF2, 144th of 161 (tied). Models without that figure are left out.

Similar ratings at 47°F

These mini-split models share the nominal cooling size. Comparisons use each model’s median certified figures across pairings.

RAV-BP421AT2P-UL: 42,000 Btu/h at 47°F (this model: 40,500); HSPF2 11.2 (this model: 8.86).
AM5-H42/2DR3B: 42,000 Btu/h at 47°F (this model: 40,500); HSPF2 10.5 (this model: 8.86).
ACIQ-42Z-E-HH-M5: 42,000 Btu/h at 47°F (this model: 40,500); HSPF2 10.25 (this model: 8.86).

Closest models by heat at 5°F

Every 42,000 Btu (3.5-ton) unit, ranked by cooling efficiency, then heating efficiency

Floor area at the cold test point

The median certified output of 34,200 Btu/h at 5°F matches the size calculator’s heating estimate for these floor areas, rounded to about 10 sq ft. Each range divides that output by the climate band’s heating rates.

Floor area by climate band and house condition
Climate band	House condition	Btu/h per sq ft	Approximate sq ft
Mild	Drafty, little insulation	24–42	810–1,430
Mild	Typical	16–26	1,320–2,140
Mild	Tight, well insulated	10–18	1,900–3,420
Cold	Drafty, little insulation	28–52	660–1,220
Cold	Typical	18–30	1,140–1,900
Cold	Tight, well insulated	12–22	1,550–2,850
Very cold	Drafty, little insulation	32–58	590–1,070
Very cold	Typical	22–38	900–1,550
Very cold	Tight, well insulated	16–28	1,220–2,140

This is an estimate, not a house-specific load calculation. Output stays at the 5°F test point for every band; it does not predict output at the band’s winter design temperature.

Certified values for 5MXTH40AVJU

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 5MXTH40AVJU
Heating
	This pairing	All pairings
Heat output at 47°F normal speed	40,500 Btu/h	40,000–41,000 Btu/h
Heat output at 17°F full speed	23,600 Btu/h	23,200–23,800 Btu/h
Heat output at 5°F full speed	34,200 Btu/h	30,400–38,000 Btu/h
Heat output below 5°F	NR	NR
Cold output 5°F output as a % of the 47°F rating	84%	74–95% of its 47°F rating. Tests use different compressor speeds.
COP at 5°F full speed	1.85	1.80–1.90
HSPF2 Region IV	8.9	8.2–9.5
Cooling
Cooling capacity at 95°F full-load test	41,500 Btu/h	40,000–43,000 Btu/h
EER2 at 95°F	10.1	8.5–11.7
SEER2 cooling season	17.95	15.9–20.0
Cooling at other temperatures	NR	NR
Equipment and listing
Refrigerant	R-32
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 some pairings
Where it is sold	US and Canada	US and Canada
Model string as certified	5MXTH40AVJU*

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) DAIKIN 34,200 Btu/hat 5°F, full speed

3 pairings · 47°F 40,500 Btu/h · 95°F cooling 41,500 Btu/h · Cold output 84% · COP 1.85

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)	DAIKIN	34,200	40,500	41,500	84%	1.85	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

Daikin3 pairings

Model number as listed

5MXTH40AVJU* 3 pairings

Variants of the same model number

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

5MXT40AVJUDaikin

1 of 2 shown.

Other model numbers with identical certified values

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

5MXT40AVJUidentical certified values

1 of 2 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.

History and definitions

Other AURORA Multi models by nominal cooling size: 2MXT18AVJU8 (18,000 Btu), 3MXT24AVJU (24,000 Btu), 3MXTH24AVJU (24,000 Btu), 4MXT36AVJU (36,000 Btu), 5MXT40AVJU (42,000 Btu).

History

First certified record: Sep 25, 2025
Most recent certified record: Jan 14, 2026
Measurements reported: Jan 14, 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, “5MXTH40AVJU — certified heat output”. Certified figures dated Sep 19, 2026, checked daily.
https://heatpumplist.com/model/5mxt40avju