Home / Comparisons / 3-ton ADD-ON central heat pumps
SAMSUNG Hylex Premium ADD-ON and MIDEA EVOX G3 ADD-ON, figure by figure
Two ways to keep your furnace and add a heat pump to it: a coil set on the furnace, an outdoor unit, and a rule that decides which one heats depending on the temperature outside. This page sets side by side what each manufacturer publishes, and what the AHRI certificates say about each one.
Hylex Premium ADD-ON · 36,000 BTU
HC48MBC021H1 / AC036FCUPCG · AHRI 218158141
See the product page
What the electricity costs, in dollars, winter and summer
AirGreen estimate for the same 36,000 BTU/h (3-ton) house in Montréal, on Hydro-Québec Rate D, taxes included. Both heat pumps are calculated exactly the same way, with the same method as on all our comparison pages; only their certified efficiencies change. The certificates give 34,000 BTU/h of cooling at 35 °C for the SAMSUNG and 36,000 for the MIDEA: the calculation uses their common nominal size, 36,000 BTU/h. Winter is based on the certificate’s Region V HSPF2, which includes the electric backup the standard provides for; the switchover to the existing furnace and the cost of gas or oil are not modelled. Electric baseboards serve as the reference.
How this amount is calculated
- Heat to supply over the winter. A house whose heat loss reaches 36,000 BTU/h ( kW) at −23.1 °C, the Montréal design temperature: kW × 24 h × 4,167 degree-days ÷ (18 − (−23.1)) = kWh of heat for round-the-clock heating, all winter. Heating degree-days (18 °C base) and design temperature: Natural Resources Canada, HOT2000 climate data, Montréal Intl station. With fewer hours a day (“Heating” slider), the heat is reduced in the same proportion, for the heat pump as for the baseboards: this simplification ignores the recovery after a temperature setback.
- Heating electricity. Heat pump: heat × 3.412 ÷ HSPF2 Region V, the AHRI certificate value published by NEEP. Region V is the coldest in the standard, and its calculation includes the electric backup heat expected when the heat pump is no longer enough. Electric baseboards: 1 kWh of electricity for 1 kWh of heat.
- Cooling electricity. 36,000 BTU/h ÷ SEER2 × hours a day × 60 days ÷ 1,000: the method of Hydro-Québec’s air-conditioning calculator, with the seasonal SEER2 efficiency from the AHRI certificate. The number of hours is a scenario, adjustable above from 1 to 24 h. At 24 h, the calculation assumes rated capacity all day long: that is a ceiling, since a variable-speed unit slows down once the room reaches its set temperature.
- Price. Hydro-Québec Rate D in effect April 1, 2026: 7.065¢ per kWh up to 40 kWh a day, 11.142¢ beyond; the average price, 9.104¢, is the one Hydro-Québec’s calculators use. GST and QST included. Grid access charges, the same with or without a heat pump, are not counted.
AirGreen method v1.1, November 9, 2026. An estimate is a way to compare units under the same conditions. The actual bill depends on the house, its insulation, the settings and how it is used; this amount is not a promise.
The heat pump on the furnace: the switchover, degree by degree
With an ADD-ON heat pump, the coil sits on the furnace and both share the same blower and the same ducts. A rule picks the heat source according to the outdoor temperature. Bring the thermometer down and move the switchover point: the cross-section shows which one heats, why, and what the certificate gives at that temperature.
existing furnace (diagram)
coil
Illustrated cross-section: the furnace and ducts are a diagram; the coil and the outdoor unit are the real photos of each system, at the same scale as each other (published widths). The MIDEA rule comes from the EVOX coil service manual (S3 switch: outdoor threshold adjustable from −30 to 8 °C, compressor locked out below the threshold, allowed again from the threshold + 2 °C). SAMSUNG states compressor lockout and changeover settings without publishing their values in the documents reviewed: for the SAMSUNG, the slider illustrates the principle. The installer chooses the threshold based on the house and the furnace.
What gets added, what stays
In both cases the furnace stays and still heats in extreme cold. A coil goes on top, an outdoor unit goes outside, along with the control that decides the switchover. That control, and the size of the units, is where the two systems differ.
HC48MBC021H1 coil + AC036FCUPCG unit
- ACU module MXD-U001XN: required and sold separately per the brochure; it sits between the outdoor unit, the thermostat and the furnace.
- Mitigation controller HA00A00203H1: listed as a required component on SAMSUNG’s Hylex coil page.
- Dual fuel: with a SAMSUNG communicating wired control or a 24 V thermostat that supports the function (note 1 of the brochure).
- Two-fan outdoor unit: 37 × 55 7/8 in, 229.3 lb.
- Stays in place: the furnace, its blower and the ducts.
MAAHE-H36B-BA coil + MO1SE-H36B-2A unit
- Control board in the coil: DIP switches and the S3 rotary switch for the outdoor switchover threshold (EVOX service manual).
- R-454B refrigerant sensor built in, per the submittal sheet.
- Control: 120N (X6W) wired control with built-in Wi-Fi, or a third-party 24 V thermostat.
- One-fan outdoor unit: 38 9/16 × 38 3/8 in, 204 lb.
- Stays in place: the furnace, its blower and the ducts.
All four units at the same scale
Published widths: SAMSUNG coil 21 in (brochure; height and weight not found in the SAMSUNG documents reviewed), MIDEA coil 17 1/2 in wide by 23 1/2 in high, outdoor units 37 and 38 9/16 in. Photos: AirGreen product pages. Grid: 12 in.
Below −15 °C: each published figure, at its exact temperature
NEEP measures both systems at the same temperatures down to −15 °C. Lower down, the SAMSUNG is measured at −25 °C and the MIDEA at −30 °C. Each value is placed at its own temperature, with its source; nothing is calculated between two points. With a furnace as backup, these figures show how far the heat pump can carry the house before the switchover.
What each manufacturer writes, line by line
Features taken from each manufacturer’s documents for these ADD-ON systems. When a document says nothing, the card says so.
SAMSUNG: configurable dual fuel with a furnace; SAMSUNG communicating control or compatible 24 V thermostat.
MIDEA: dual-fuel capability; “one source at a time” setting by default.
SAMSUNG: heating stated down to −25 °C.
MIDEA: heating stated from −30 to 24 °C.
SAMSUNG: ACU module MXD-U001XN required, sold separately; SAMSUNG wired control or 24 V thermostat.
MIDEA: 120N (X6W) wired control or third-party 24 V thermostat.
SAMSUNG: not stated in the documents reviewed for the ADD-ON system.
MIDEA: Wi-Fi built into the 120N (X6W) wired control.
SAMSUNG: HA00A00203H1 mitigation controller listed as required with Hylex coils.
MIDEA: R-454B refrigerant sensor built into the coil.
SAMSUNG: BLDC twin rotary, two-fan unit (technical data book).
MIDEA: twin rotary (submittal sheet).
Outdoor unit noise, as each manufacturer states it
A coil has no fan: indoors, what you hear is the existing furnace blower, with or without a heat pump. The comparison is therefore about the outdoor unit, and the two manufacturers do not measure the same way.
How to read these figures. dB(A) measures a noise level as the ear perceives it: the lower the figure, the quieter the unit. Each point is a published value.
Why this is not a ranking. SAMSUNG publishes a sound pressure measured in an anechoic chamber, in cooling and in heating. MIDEA publishes a level of 64 dB(A) without stating the method in this system’s sheet (63 dB(A) in the sheet of the complete EVOX G3 system, for the same outdoor unit). Different method — not comparable.
Outdoor unit, outside
Published values
Measurements taken by each manufacturer with its own method: read them as reference points, not as a ranking.
Piping, electrical and size
Piping length between the coil and the outdoor unit
Published rates: 0.5 oz/ft beyond 24.6 ft for the SAMSUNG (technical data book), 0.7 oz/ft beyond 25 ft for the MIDEA (submittal sheet). The installer always follows the installation manual and the nameplate.
| Installation | SAMSUNG | MIDEA |
|---|---|---|
| Maximum piping length | 164 ft | 246 ft |
| Precharged length | 24.6 ft | 25 ft |
| Maximum height difference | 98 ft | 98 ft |
| Liquid – gas diametersPer the manufacturer | 3/8 – 7/8 ingas 3/4 in minimum, 1 1/8 in maximum | 3/8 – 3/4 inflare connections |
| Factory refrigerant charge | 9.9 lb (4.50 kg) of R-454B | 127 oz (3.6 kg) of R-454B |
| Outdoor unit W × H × D, weight | 37 × 55 7/8 × 13 in, 229.3 lb | 38 9/16 × 38 3/8 × 16 3/8 in, 204 lb |
| Indoor unit (coil) W × H × D, weight | 21 in wideheight, depth and weight not found in the SAMSUNG documents reviewed | 17 1/2 × 23 1/2 × 21 in, 59.5 lb |
| Outdoor unit electrical protectionPer the manufacturer | MCA 33.3 A · MOP 40 A | MCA 29 A · MOP 30 A |
| Stated heating / cooling range | −25 to 24 °C / −20 to 52 °C | −30 to 24 °C / −30 to 50 °C |
Sources: SAMSUNG Technical Data Book Hylex Standard & Premium R454B, version 2.0 (August 29, 2025), and submittal sheet AC036FCUPCG/AA; Hylex brochure HYLEXBR 02.2026-V2 for the coil width. MIDEA: submittal sheet MAAHE-H36B-BA / MO1SE-H36B-2A.
What people ask about these two ADD-ON systems
What is an ADD-ON heat pump?
A central heat pump whose indoor coil sits on an existing furnace, instead of a complete air handler. The furnace keeps its blower and serves as backup heat; the heat pump heats and cools through the same ducts.
At what temperature does the furnace take over?
At the temperature chosen at installation. For the MIDEA, the EVOX coil manual provides an outdoor threshold adjustable from −30 to 8 °C. SAMSUNG states compressor lockout and changeover settings without publishing their values in the documents reviewed. Below the heat pump’s stated range (−25 °C for the SAMSUNG, −30 °C for the MIDEA), the furnace does the heating.
What about Hydro-Québec Rate DT?
Rate DT is for dual-energy systems with an automatic switching device: below −12 °C or −15 °C depending on the region, heating switches to fuel. The conditions are Hydro-Québec’s; this page does not calculate any amount on Rate DT.
Why doesn’t the winter cost count gas?
The method is the same on all our pages: winter is calculated on the certificate’s Region V HSPF2, which assumes electric backup. The furnace’s share depends on the switchover threshold, the furnace and the fuel price; it is not modelled here.
Are both ENERGY STAR?
NEEP lists both ADD-ON systems as cold climate, but not as ENERGY STAR. Program eligibility depends on the official list in effect on the purchase date; this page promises no amount.
Why is the SAMSUNG measured at −25 °C and the MIDEA at −30 °C?
Each system is measured at the bottom of its stated range: −13 °F (−25 °C) for the SAMSUNG, −22 °F (−30 °C) for the MIDEA. The 26,300 and 28,600 BTU/h at those points therefore do not compare directly; at −15 °C, the same temperature for both, NEEP gives 37,600 and 36,000 BTU/h.
All AHRI and NEEP values
| Certified value | SAMSUNG Hylex Premium ADD-ON | MIDEA EVOX G3 ADD-ON |
|---|---|---|
| Cooling | ||
| Rated capacity at 35 °C | 34,000 BTU/h | 36,000 BTU/h |
| SEER2 | 16.0 | 15.8 |
| EER2 | 11.5 | 10.7 |
| Heating, same conditions | ||
| HSPF2 Region IV / V | 8.5 / 6.8 | 9.4 / 7.9 |
| 8.3 °C: min. / rated / max.BTU/h | 11,000 / 35,000 / 55,000 | 11,900 / 38,000 / 46,000 |
| 8.3 °C: COP at min., rated, max. | 4.61 / 3.40 / 2.27 | 4.25 / 3.30 / 2.97 |
| −8.3 °C: min. / rated / max.BTU/h | 20,500 / 21,600 / 40,900 | 9,300 / 29,200 / 39,000 |
| −8.3 °C: COP at min., rated, max. | 2.72 / 2.42 / 2.36 | 2.60 / 2.50 / 2.18 |
| −15 °C: min. / rated / max.BTU/h | 15,100 / 37,600 / 37,600 | 10,400 / 36,000 / 36,000 |
| −15 °C: COP at min., rated, max. | 2.41 / 1.87 / 1.87 | 1.77 / 1.90 / 1.90 |
| Coldest point — different temperatures, not highlighted | ||
| Test temperature | −25 °C (−13 °F) | −30 °C (−22 °F) |
| Capacity min. / max. | 11,700 / 26,300 BTU/h | 5,500 / 28,600 BTU/h |
| COP at maximum capacity | 1.71 | 1.61 |
| Listings and refrigerant | ||
| ENERGY STAR / cold climate (NEEP) | No / Yes | No / Yes |
| AHRI certificate · NEEP record | 218158141 · 506857 | 216623524 · 381863 |
| RefrigerantGWP per the IPCC (AR4); ASHRAE 34 class | R-454B · GWP 466 · A2L | R-454B · GWP 466 · A2L |
higher marks the higher value of a given measure, under the same conditions. It is not a recommendation. Capacities and COPs at each test point are not highlighted: which one is higher changes from point to point.
Both are on the AirGreen website.
To choose for your house, talk it over with our team: bring the age and type of your furnace, the heated area, the condition of the ducts and the spot planned outside for the outdoor unit.
Where each figure comes from
Data checked on November 9, 2026. Performance: AHRI certificates and the NEEP database. Dimensions, sound, piping, controls and features: per the manufacturer. When a source contradicts the AHRI certificate, the certificate prevails.
Trademarks. SAMSUNG, Hylex, MIDEA and EVOX are trademarks of their respective owners. Logos are used only to identify the products compared. AirGreen is a dealer for these brands; this page is not produced, sponsored or endorsed by the manufacturers.
Photos: AirGreen and the manufacturers, for identification.
Does a figure look wrong to you? Write to us: every reported figure is checked again.