Spec MrCool for Multi-Family Housing Projects

Ductless Is the Future of Multi-Family HVAC

Multi-family housing — apartments, condos, townhomes — presents unique HVAC challenges that ductless mini splits solve better than any traditional system. Individual unit control, separate utility metering, space savings, and dramatically lower installation costs make MrCool systems the smart choice for multi-family developers and the contractors who serve them.

Why Traditional HVAC Fails Multi-Family

Central Systems

Centralized boiler/chiller systems with fan coil units have dominated large multi-family for decades. Problems:

• Massive upfront cost for central plant equipment
• Common-area utility metering forces condo associations to split costs (creates billing disputes)
• One system failure affects all units
• Maintenance requires access to central plant and individual unit fan coils
• Cannot be individually controlled beyond a thermostat override range

Individual Ducted Systems

Giving each unit its own ducted system solves the metering problem but creates others:

• Ductwork requires chase space, dropped ceilings, and soffits
• Mechanical closet in each unit consumes 15-25 sq ft of livable space
• Installation time: 2-3 days per unit for ductwork alone
• Noise from air handlers in closets adjacent to living spaces

The Ductless Solution

MrCool ductless mini splits eliminate every problem above:

Individual Metering (Built-In)

Each unit gets its own mini split system on its own electrical circuit. The resident pays their own electric bill for heating and cooling. No common utility allocation, no billing disputes, no HOA drama.

Space Savings

No ductwork means no duct chases, no dropped ceilings, and no mechanical closet. In a 750 sq ft one-bedroom apartment, eliminating the mechanical closet and ductwork soffits recovers 25-40 sq ft of livable space. At $300-$500/sq ft construction cost, that's $7,500-$20,000 in recovered value per unit.

For a 50-unit building, that's $375,000-$1,000,000 in additional sellable/rentable square footage. The HVAC savings pay for the HVAC system.

Installation Speed

A two-person crew can install a MrCool single-zone or multi-zone system in a single unit in 4-8 hours. For a 50-unit building, that's 50-100 crew-days versus 150-250 crew-days for ducted systems. Faster HVAC means faster certificate of occupancy.

Maintenance Simplicity

Each unit's system is independent. If Unit 4B has a problem, it's isolated to Unit 4B. No common-area mechanical room to schedule access for, no shared system affecting other residents. The resident can even arrange their own warranty service directly with MrCool if needed.

Recommended Configurations by Unit Type

Studio / Efficiency (300-500 sq ft)

MrCool 9K single-zone One wall-mount air handler handles the entire studio. Mount above the living area; the bedroom alcove gets conditioned air from the same unit. Simple, efficient, one outdoor condenser per unit.

One-Bedroom (550-800 sq ft)

MrCool 12K or 18K single-zone A 12K handles most one-bedrooms. Go 18K if there's significant window exposure or the unit faces south/west. For higher-end projects, consider a dual-zone with a 9K in the bedroom and a 12K in the living area for independent temperature control.

Two-Bedroom (800-1,200 sq ft)

MrCool multi-zone (18K or 24K condenser + 2-3 air handlers) Each bedroom gets a 9K air handler, living area gets a 12K. The 24K outdoor condenser powers all three with individual zone control. This configuration provides true room-by-room comfort.

Three-Bedroom (1,100-1,500 sq ft)

MrCool multi-zone (36K condenser + 3-4 air handlers) Bedroom air handlers (9K each) plus living area (12K-18K). The 36K condenser has capacity for four zones comfortably.

Outdoor Unit Placement

The biggest design consideration for multi-family ductless is condenser placement. Options:

Balcony Mounting

Common for mid-rise buildings. Each unit's condenser sits on their balcony. Pros: easy access for maintenance, short line sets. Cons: noise on the balcony, aesthetic impact.

Ground-Level Pad

For low-rise buildings (2-3 stories), condensers can sit at ground level. Line sets run up the exterior wall to their respective units. Pros: out of sight, easy service access. Cons: longer line sets for upper floors, ground-level space required.

Rooftop

All condensers on the roof. Line sets run through interior chases. Pros: ground and balcony space preserved. Cons: roof access needed for service, longer line sets, structural considerations.

Exterior Wall Brackets

Condensers mounted on exterior walls using brackets. Common in dense urban areas. Pros: minimal ground/roof impact. Cons: aesthetic concerns, noise transmission through walls.

Work with the architect early in design to determine the optimal approach. The condenser placement decision affects line set lengths, electrical routing, and aesthetic impact.

Energy Code Compliance

MrCool systems exceed current energy code requirements in all U.S. jurisdictions:

• SEER2 up to 22: Exceeds the federal minimum of 14.3 SEER2 (South) and 13.4 SEER2 (North)
• HSPF2 up to 10: Exceeds the federal minimum of 7.5 HSPF2
• ENERGY STAR certified: Qualifies for utility rebate programs in most states

For projects pursuing LEED, ENERGY STAR Multifamily, or similar green certifications, MrCool's efficiency ratings contribute significant points toward certification.

Get Project Pricing from HVACZAR

HVACZAR provides volume wholesale pricing for multi-family projects. Contact our contractor desk with your unit count and floor plans for a complete system specification and quote. We handle job site delivery, staggered to match your construction phases.