MRCOOL Universal 4 Ton 48,000 BTU Central Ducted Heat Pump - Complete System (R454B Refrigerant)

The MRCOOL Universal 4 Ton 48,000 BTU Central Ducted Heat Pump - Complete System is a fully integrated central ducted heat pump split system designed to replace traditional forced-air heating and cooling equipment using your home's existing ductwork. Rated at 17.5 SEER2—the highest efficiency in the Universal lineup at this capacity—it holds ENERGY STAR Most Efficient 2025 and Cold Climate certification and qualifies for federal tax credits. The multi-position air handler is sized to match a standard furnace cabinet width, giving homeowners a direct upgrade path without duct modification.

Key specifications

• Capacity — 48,000 BTU/h (4 tons) cooling and heating
• Efficiency ratings — 17.5 SEER2 / EER2 12.0 / HSPF2-4 9.5
• Multi-position air handler — upflow, downflow, or horizontal installation; 21.50 in. wide to match a standard furnace footprint
• Cold climate rated — 100% heating output at -13°F; 100% cooling output at 110°F
• Certifications & warranty — ENERGY STAR Most Efficient 2025 (Cold Climate), federal tax credit eligible, AHRI certified, UL listed; 10-year parts and compressor warranty

Year-round efficiency, lower energy bills

Aging gas furnaces and low-SEER central AC units typically cost more per BTU than a well-sized heat pump — and standard heat pumps often fall back on expensive electric resistance coils once outdoor temperatures drop below 35°F. The Universal 4 Ton closes that gap with an HSPF2-4 of 9.5 and proven full-capacity output at -13°F, meaning it keeps heating efficiently through conditions that defeat most conventional ducted heat pumps. The 17.5 SEER2 rating delivers the same advantage in summer, cutting cooling energy consumption versus typical 14–15 SEER2 replacements.

Key Applications

• Furnace replacement — The 21.50 in. wide air handler fits the same cabinet opening as most residential gas furnaces; multi-position orientation (upflow, downflow, horizontal) covers virtually any existing installation layout without duct modification.
• All-electric home conversion — Eliminates natural gas heating as the primary system, with optional 5kW–20kW auxiliary electric heat kits available for the coldest days when additional backup capacity is needed.
• Cold-climate primary heating — Cold Climate ENERGY STAR certification confirms reliable full-output performance in northern U.S. and high-elevation markets where standard heat pumps underperform in winter.
• New construction — Multi-position flexibility and automatic voltage detection simplify rough-in coordination across a wide range of floor plans and electrical service configurations.
• Rebate-driven equipment upgrades — Qualifies for federal tax credits, CEE Tier 1 (North and South), NEEP, and regional programs including MASS Save, reducing the effective net system cost significantly.

M-coil, multi-voltage, and No-Vac ready

• 100% aluminum M-shaped coil — The M-profile heat exchanger increases surface area in a compact cabinet envelope; full aluminum construction resists corrosion better than copper-aluminum hybrid coils.
• Automatic voltage detection — The indoor air handler accepts 115V or 208/230V single-phase power and identifies the supply voltage automatically on startup — no manual jumper settings or rewiring when service voltage differs from the standard.
• No-Vac line set compatible — Works with optional MRCOOL No-Vac pre-charged line sets (sold separately), which can eliminate the need for a vacuum pump and refrigerant handling at the time of installation.
• Slide-out auxiliary heat kit slot — The air handler includes a built-in slide-out bracket that accepts optional Universal heat kits from 5kW to 20kW, adding supplemental or emergency electric heat without disassembling the cabinet.

Wiring, line sets, and heat kits

The outdoor condenser (UHP18048-O) requires a dedicated 208/230V single-phase circuit with a minimum circuit ampacity of 38A and a maximum 40A fuse. The indoor air handler (UAH18048-O) connects to 115V or 208/230V single-phase supply with a 15A maximum fuse and auto-detects input voltage. Standard line set sizing is 3/8 in. liquid / 3/4 in. gas; optional MRCOOL No-Vac pre-charged line sets are compatible and available separately. Auxiliary heat kits from 5kW to 20kW integrate via the air handler's slide-out slot and are sold separately through the Universal heat kit lineup. The system uses R-454B refrigerant, a next-generation lower-GWP refrigerant meeting current EPA requirements.

Why choose the MRCOOL Universal 4 Ton?

At the 4-ton capacity, few ducted systems combine a 17.5 SEER2 rating, Cold Climate ENERGY STAR certification, and a multi-position air handler sized to drop into a standard furnace space — all as a complete matched system. The automatic voltage detection removes a common installation complication, and the No-Vac line set compatibility gives installers a faster setup option without refrigerant handling equipment on-site. For homeowners replacing a gas furnace, switching to all-electric, or simply prioritizing efficiency and rebate eligibility, the MRCOOL Universal 4 Ton addresses each of those priorities without requiring component-by-component sourcing.