Air-source heat pumps
Mitsubishi M-Series SUZ-AK36NLHZ Hyper-Heating
Prices are the equipment only — the appliance, before install labour. Where we could only find an installed price, the labour is a national planning estimate backed out to approximate the equipment, so treat those as rough. Get contractor quotes for the install itself.
Mitsubishi's ducted Hyper-Heating outdoor unit, pairable with a conventional air handler for whole-house ducted retrofit.
Our take
Mitsubishi built its reputation on ductless, and this is that engineering applied to a ducted system — including the Intelli-HEAT configuration that lets you keep an existing gas furnace as backup. For a retrofit where you want to electrify heating without abandoning a serviceable furnace, that hybrid path is genuinely useful and under-marketed.
Best for
Ducted retrofits, especially dual-fuel setups keeping an existing furnace.
Watch out for
Pricing runs high and you must use a Diamond dealer for the full warranty. Registration within 90 days is mandatory.
How it performs by climate zone
Heating capability against each zone's 99% winter design temperature.
| Zone | Design temp | Verdict |
|---|---|---|
| 3C — Warm – Marine | 36°F | Strong fit Rated to -13°F, comfortably below this zone's 36°F design temperature, and holds 85% of capacity at 5°F. |
| 4A — Mixed – Humid | 14°F | Strong fit Rated to -13°F, comfortably below this zone's 14°F design temperature, and holds 85% of capacity at 5°F. |
| 4B — Mixed – Dry | 18°F | Strong fit Rated to -13°F, comfortably below this zone's 18°F design temperature, and holds 85% of capacity at 5°F. |
| 4C — Mixed – Marine | 27°F | Strong fit Rated to -13°F, comfortably below this zone's 27°F design temperature, and holds 85% of capacity at 5°F. |
| 5A — Cool – Humid | 2°F | Strong fit Rated to -13°F, comfortably below this zone's 2°F design temperature, and holds 85% of capacity at 5°F. |
| 5B — Cool – Dry | 3°F | Strong fit Rated to -13°F, comfortably below this zone's 3°F design temperature, and holds 85% of capacity at 5°F. |
| 6A — Cold – Humid | -8°F | Workable Rated to -13°F against a -8°F design temperature — enough margin, though backup heat will run on the coldest days. |
| 6B — Cold – Dry | -10°F | Marginal Rated to -13°F with a -10°F design temperature leaves almost no margin. Expect backup heat to carry a meaningful share of the load. |
| 7 — Very Cold | -20°F | Not suitable Rated only to -13°F, but this zone's design temperature is -20°F. |
| 8 — Subarctic | -40°F | Not suitable Rated only to -13°F, but this zone's design temperature is -40°F. |
What sellers are actually charging
Real listings, read on the date shown. Prices change — click through to check before you act on any of them.
| Seller | What you get | Price | Seen |
|---|---|---|---|
| Got Ductless
online retailer |
Mitsubishi SUZ-KA36NAHZ 36,000 BTU Hyper Heat outdoor unit (R-410A)
SUZ-KA36NAHZ |
$4,543 | 2026-08-16 |
| Got Ductless
online retailer |
Mitsubishi SUZ-AK36NLHZ 36,000 BTU Hyper Heat outdoor unit (R-454B)
SUZ-AK36NLHZ |
$5,008 | 2026-08-16 |
Equipment price is not installed price. The listings above are what the hardware costs. Installation — labour, electrical, refrigerant lines, permits, removing the old system — is typically a similar amount again, and varies more between contractors than between brands. Where we have an installed figure it is labelled as such and comes from someone who actually installs.
Model number check: corrected
Corrected 2026-08-26: this catalog entry originally wrote 'SUZ-KA/NLHZ', which conflated two distinct generations sold separately -- SUZ-KA36NAHZ (R-410A, previous) and SUZ-AK36NLHZ (R-454B, current). Updated to name the current R-454B generation, SUZ-AK36NLHZ, matching the refrigerant already on record for this entry. The previous-generation SUZ-KA36NAHZ listing is kept as a price-floor reference, not as this entry's own SKU.
What owners and installers report
Collected from trade forums, owner communities and video reviews. Every report links to the original. We synthesise and quote briefly — we don't republish other people's writing.
Reliability and failures
What breaks, when, and how often — from people several years in.
Thin evidence — too few independent reports to call this a pattern. Shown because it may still be worth asking your contractor about.
A Cape Cod owner of six years said their Mitsubishi splits had been trouble-free apart from routine cleaning.
“Mitsubishi splits…have been flawless for the last 6 years, other than routine cleaning” — owner homeowner, 2025
New heat pump for the season · Hearth.com Forums · 2025-01-01 · read it in context
Cold-weather performance
Whether the unit actually keeps the house warm when it gets cold, and how hard backup heat has to work. On a heat pump water heater this is whether it stays in efficient heat-pump mode or falls back to resistance heat in a cold space.
Thin evidence — too few independent reports to call this a pattern. Shown because it may still be worth asking your contractor about.
An owner reported their Hyper-Heat unit, rated to -13°F, still heated well when they deliberately tested it at -5°F.
“My mitsu unit with hyper heat is rated to -13F. At -5F I cranked it up as a test and it still worked great.” — owner homeowner, 2013
Mitsubishi heat pump · Hearth.com Forums · 2013-01-01 · read it in context
A Maine owner said their larger Hyper-Heat unit held an open 24×24 area at 70°F through the winter, including nights near 8 below zero.
“kept a 24 x24 open area at 70 even those couple night when we hit 8 below” — owner homeowner, 2021
Mitsubishi heat pump quote · Hearth.com Forums · 2021-01-01 · read it in context
Defrost behaviour
How often the unit defrosts, how loud it is, and whether the house gets cold during the cycle. Rarely appears in any specification.
Thin evidence — too few independent reports to call this a pattern. Shown because it may still be worth asking your contractor about.
The same owner noted the defrost cycle becomes audible below about 35°F, but output at 17°F was adequate for their space.
“22k BTU at 17 F - but that's enough for my place unless it's also very windy” — owner homeowner, 2025
New heat pump for the season · Hearth.com Forums · 2025-01-01 · read it in context
Noise in real installations
What owners report hearing, versus the manufacturer's rated sound level. Rated figures are measured under controlled conditions that rarely match a real installation.
Thin evidence — too few independent reports to call this a pattern. Shown because it may still be worth asking your contractor about.
An installer starting a Hyper-Heat unit at 15°F in a room over a garage found it heated well and ran nearly silently.
“I fired one off at 15 degrees… it worked great and just about noiseless.” — installer homeowner, 2013
Mitsubishi heat pump · Hearth.com Forums · 2013-01-01 · read it in context
Sources are linked so you can verify any of this yourself. We don't mirror content — Amazon in particular permits no republication of review text, so where we use retailer data we show the aggregate rating and link out. How we collect and weight this →
Compare against
Mitsubishi P-series PUZ-AK48NLHZ Hyper-Heat Ducted System
Mitsubishi's 4-ton ducted Hyper-Heat system on R-454B — the best-documented cold-climate performer in this set, NEEP-listed with a full 5°F dataset.
Carrier Infinity 24 Heat Pump with Greenspeed Intelligence (25VNA4)
Carrier's flagship variable-speed ducted heat pump, and one of very few conventional split systems that holds full heating capacity down to 0°F.
Bosch IDS Ultra Inverter Ducted Split
Variable-speed ducted heat pump that undercuts the premium American brands on price while matching most of their cold-weather capability.
Daikin Fit Aurora DH9VS
Side-discharge variable-speed heat pump with a small footprint, rated for cold-climate operation to -13°F.
Before you buy this
Ask the contractor for the AHRI certificate number for the specific indoor/outdoor combination being installed — ratings apply to matched pairs, not to the outdoor unit alone. Ask whether they will perform a Manual J load calculation rather than sizing off the equipment being replaced. And check your state and utility incentive programmes: there is no federal tax credit for a 2026 installation, so those programmes are now the only incentive money available, and many require approval before installation.