New Mitsubishi MXZ-SM48NL Installation in Walnut Creek — A Perfect Blend of Comfort and Efficiency
At Galaxy Heating, Air Conditioning, Solar & Electrical, we pride ourselves on bringing the latest HVAC technology to our customers. We’re excited to share a recent project we completed for a homeowner in Walnut Creek, where we installed the brand-new Mitsubishi MXZ-SM48NL multi-zone heat pump system — one of the first systems on the market to use R-454B refrigerant, a next-generation, more environmentally friendly option.
Our customer wanted a sleek, energy-efficient solution that provided quiet, even comfort throughout their home — without the look or bulk of traditional ductwork. Here’s what we designed and installed:
- Mitsubishi MXZ-SM48NL Outdoor Unit (new R-454B refrigerant model)
- Three MLZ-KX09NL One-Way Ceiling Cassettes
- One MFZ-KX18NL Floor-Mounted Unit
Why Mitsubishi MXZ-SM48NL?
The MXZ-SM48NL is Mitsubishi’s latest multi-zone outdoor system designed to work with the new R-454B refrigerant, which offers a significantly lower Global Warming Potential (GWP) compared to the previous generation R-410A systems. This means it’s not just about comfort — it’s about protecting the environment and meeting the newest regulatory standards, especially important for future home value and compliance.
Beyond the refrigerant, the MXZ-SM48NL offers:
- High efficiency (up to 21 SEER)
- Whisper-quiet operation
- Flexible zoning — each indoor unit operates independently
- Hyper-Heating (H2i®) technology for reliable warmth even in cold winters
Indoor Units: Comfort Meets Aesthetics
MLZ-KX09NL Ceiling Cassettes
For the bedrooms and office spaces, we installed three MLZ-KX09NL low-profile ceiling cassettes. These slim units fit between standard 16″ joists, making them ideal for retrofit applications without major drywall work. They deliver strong, even airflow across the room and have a clean, flush-mounted look — practically disappearing into the ceiling.
MFZ-KX18NL Floor-Mounted Unit
In the living room, where the customer wanted a more traditional air distribution but without losing wall space, we installed a floor-mounted MFZ-KX18NL. These units are perfect for spaces with large windows or minimal wall area and offer fast heating performance, making the living area cozy within minutes.
Installation Highlights
Since the home in Walnut Creek had limited attic and wall space, the Galaxy Services team carefully routed the refrigerant lines through existing soffits and attic runs, keeping everything neat and minimally invasive. The ceiling cassettes were installed with minimal ceiling patching needed, preserving the beautiful interior finishes.
The floor-mounted unit was perfectly placed below a window, ensuring ideal air circulation without blocking views or furniture arrangements.
All systems were connected to individual wireless controllers, giving the customer complete flexibility to adjust temperatures room-by-room — or even set different modes depending on the season.
Benefits to the Homeowner
- Energy Savings — Ultra-efficient inverter-driven compressor technology dramatically lowers electricity bills
- Quiet Comfort — Each room operates independently and silently, enhancing overall living quality
- Future-Proof — New R-454B refrigerant aligns with 2025 EPA regulations and California energy codes
- Customized Zoning — No more fighting over thermostat settings! Each room has its own temperature control
- Elegant Look — The ceiling cassettes and floor unit seamlessly integrated into the home’s modern decor
If you’re considering upgrading your home comfort system in the Bay Area, Galaxy Heating, Air Conditioning, Solar & Electrical is ready to help! We specialize in modern, efficient, and beautiful HVAC solutions tailored to your home’s needs — and we’re already trained and experienced with Mitsubishi’s newest R-454B models.
Call us today to schedule your free in-home consultation and find out how we can help you step into the future of home comfort.