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Halcyon XLTH: The coldest-rated (-15°F), most efficient (HSPF2 14.0, SEER2 33.1) heat pump available in CT. 195 Energize CT qualified models. $300–$800 less per zone than Mitsubishi.
-15\u00B0F
Coldest Rating
14.0
HSPF2 (Highest)
33.1
SEER2 (Highest)
195
CT QPL Models
Fujitsu's Halcyon XLTH is the efficiency champion of the CT heat pump market. With an HSPF2 of 14.0 (highest available) and SEER2 of 33.1 (highest available), the XLTH delivers the lowest annual operating cost of any heat pump sold in Connecticut. Its -15°F minimum operating temperature is also the coldest rating on the market — 2°F below Mitsubishi's Hyper-Heat.
With 195 models on the Energize CT Qualified Product List (second only to Mitsubishi's 198), Fujitsu qualifies for the full range of CT incentives: Energize CT rebates ($250–$1,000/ton) and the Smart-E Loan at 0.99% APR. The key advantage? Fujitsu is typically $300–$800 less per zone than comparable Mitsubishi installations, making it the best value in the premium cold-climate segment.
The Fujitsu Diamond Contractor program ensures quality installation across CT. While the network is slightly smaller than Mitsubishi's, Fujitsu Diamond Contractors receive specialized cold-climate training and have access to priority parts supply. For CT homeowners doing 1–4 zone ductless installations, Fujitsu offers the best combination of performance, efficiency, and value.
No Federal Tax Credit in 2026
Section 25C expired December 31, 2025. CT incentives only: Energize CT rebates ($250–$1,000/ton) and Smart-E Loan at 0.99% APR (through March 31, 2026).
14.0
HSPF2
Heating Seasonal Performance Factor. Higher = less electricity per BTU of heat. The XLTH uses 10–15% less electricity than a Mitsubishi Hyper-Heat (HSPF2 12.5) for the same heating output.
33.1
SEER2
Seasonal Energy Efficiency Ratio for cooling. The XLTH is 50% more efficient than a SEER2 22 unit in cooling mode. Critical for CT's increasingly hot summers (95°F+).
-15°F
Min Operating Temp
The coldest-rated residential heat pump. Continues operating at reduced capacity to -22°F. In CT, this means virtually zero backup heating hours needed per year.
Compare specs, price, warranty, and CT rebate eligibility
| Spec | Fujitsu | Mitsubishi |
|---|---|---|
| Top Model | Halcyon XLTH (ASU/AOU-RLS3Y) | MSZ-FH (Hyper-Heat) |
| Min Operating Temp | -15°F | -13°F |
| HSPF2 | 14.0 | 12.5 |
| SEER2 | 33.1 | 22.0 |
| Indoor Noise | 21 dB | 19 dB |
| Refrigerant | R-32 | R-32 |
| Compressor Warranty | 10 years | 12 years |
| Parts Warranty | 5 years | 7 years |
| Price (Single Zone) | $4,200–$5,800 | $4,500–$7,500 |
| Energize CT Qualified | Yes (195 models) | Yes (198 models) |
| Smart-E 0.99% APR | Eligible | Eligible |
| CT Installer Network | Good (Diamond Contractor) | Excellent (Diamond Dealer) |
Single-zone ASU-RLS3Y (XLTH)
Compact footprint handled by single wall-mount. SEER2 33.1 tames attic bedrooms in summer. Budget-friendly at $4,200–$5,800.
1–2 zone XLTH
Open floor plan heated efficiently with 1–2 heads. Single outdoor unit keeps yard space clear. Great for downsizers.
Multi-zone AOU-RLXFxH + heads
Floor-by-floor zoning: head downstairs + heads in 2–3 bedrooms. XLTH efficiency keeps bills low despite multi-zone.
Single-zone supplemental
Most affordable way to heat/cool an addition. No ductwork extension needed. -15°F handles sunroom glass heat loss.
A single-zone Fujitsu Halcyon XLTH costs $4,200–$5,800 installed in CT — typically $300–$800 less than a comparable Mitsubishi. Multi-zone systems run $10,000–$15,000 for 2–4 zones. After Energize CT rebates ($250–$1,000/ton), net costs are typically $3,700–$12,500. Smart-E Loan at 0.99% APR is available through March 31, 2026.
The Fujitsu XLTH wins on efficiency (HSPF2 14.0 vs 12.5, SEER2 33.1 vs 22.0) and cold-weather rating (-15°F vs -13°F) at a lower price. Mitsubishi wins on warranty (12yr vs 10yr compressor), CT installer network size, ducted options (SVZ), and maximum zone capacity (8 vs 4). For most CT homeowners doing 1–4 ductless zones, Fujitsu offers better value. For large homes needing 5+ zones or ducted, Mitsubishi is better.
Fujitsu has 195 models on the Energize CT Qualified Product List as of March 2026 — second only to Mitsubishi (198). The XLTH (extra low temperature heating) line is the primary cold-climate product. Both single-zone and multi-zone configurations qualify for Energize CT rebates and Smart-E financing.
Yes. The Fujitsu Halcyon XLTH maintains rated heating capacity down to -15°F and continues operating at reduced capacity to approximately -22°F. This is the lowest operating temperature of any residential heat pump on the market. In CT, where sustained temperatures below -10°F are rare, the XLTH provides a significant performance margin.
SEER2 33.1 means the Fujitsu XLTH is the most efficient cooling unit on the market. In CT’s hot, humid summers, this translates to approximately 35–40% lower cooling costs compared to a SEER2 20 unit. For a home spending $400–$600/summer on AC, expect savings of $140–$240/summer. Combined with heating efficiency (HSPF2 14.0), the XLTH delivers the lowest total annual operating cost of any heat pump available in CT.
Fujitsu offers a 10-year compressor warranty and 5-year parts warranty when installed by a Diamond Contractor. This is 2 years shorter than Mitsubishi’s compressor warranty (12 years) but still among the best in the industry. Extended warranty options may be available through your installer.
Yes. All 195 Fujitsu models on the Energize CT Qualified Product List are eligible for the Smart-E Loan at 0.99% APR for heat pump projects. Maximum loan: $40,000. Terms: 5–20 years. The 0.99% rate is available through March 31, 2026. Installation must be by an HPIN-registered contractor.
Fujitsu Halcyon XLTH is ideal for CT Cape Cod style homes (1–2 zones handle the compact layout), ranch homes (single-zone covers open plan), older colonials without ductwork (multi-zone for floor-by-floor control), and additions/sunrooms (single-zone for supplemental heating). Less ideal for large homes needing 5+ zones (max 4 indoor heads per outdoor unit) or homes wanting ducted whole-home heating.
See how the Halcyon XLTH's top-tier efficiency translates to real savings. Energize CT rebate and Smart-E financing calculations included.
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