Case Study: Luxury Home BOSCH Hybrid HVAC Upgrade in Shrewsbury, MA

A Dual Fuel System Built for Comfort, Efficiency, and Performance

When the homeowners of a spacious 5,190 square foot, 4-bedroom home in Shrewsbury, Massachusetts began researching options to upgrade their aging hydro-air heating system, they were looking for performance, reliability, and long-term savings. Their 2007-built home required a solution that could handle New England winters while enhancing summer comfort—and lower utility bills.

hat’s why they partnered with Denommee Plumbing, HVAC & Electric, a trusted Bosch Home Comfort Pro and Mass Save Heat Pump Leader Network member, to install a powerful, cold-climate dual fuel hybrid HVAC system featuring two 3-ton Bosch IDS variable-speed heat pumps and air handlers with integrated hydronic heat coils.

Let’s take a closer look at how this sophisticated upgrade came together—and what makes hybrid systems an ideal choice for discerning homeowners.

What Is a Hybrid HVAC System?

A hybrid HVAC system—also called a dual fuel system—combines the energy efficiency of a cold-climate heat pump with the reliability of a gas backup heat source. In this case, Denommee integrated Bosch inverter-driven heat pumps with hydronic coils powered by the home’s existing natural gas boiler.

The result? The system automatically switches between electric and gas heating based on temperature, cost-efficiency, and performance needs. The heat pump runs during milder weather, saving money and energy. When temps dip below a certain point, the gas boiler engages, ensuring warm air continues to flow.

Project Highlights: HVAC System Installation Details

Equipment Installed:

Denommee installed two identical systems, each serving a zone of the home:

Outdoor Unit (Qty: 2)
- Bosch BOVA-36RTB-M20S
- 3.0 Ton Inverter Heat Pump
- Variable capacity
- SEER2: 19 | HSPF2: 9.5
- High Heat Output: 34,200 BTU at 47°F, 24,400 BTU at 5°F
Indoor Unit (Qty: 2)
- Bosch BIVA-36RCB-M20X
- ECM Multi-Position Air Handler
- Integrated hydronic coil (AQUECOIL HHU-GS-2)
Zone Control Panels (Qty: 2)
- Honeywell TrueZONE® HZ432
- Dual fuel applications up to 3H/2C

This system design allowed full control of heating and cooling in multiple zones, improved air distribution, and exceptional cold-weather performance with quiet, variable-speed operation.

Installation Scope & Workmanship

Every detail of this installation was executed by Denommee’s in-house licensed HVAC, plumbing, and electrical technicians, eliminating delays and miscommunication between trades. The installation included:

Removal and responsible disposal of old air handlers and condensers
Connection and pressure testing of new refrigerant lines
Drainage and refill of hydronic heating zones
Installation of zone panels and electrical controls
Line voltage wiring, surge protection, and new disconnects
Commissioning of both systems to Bosch specifications
Full labeling and documentation for homeowner and permit inspections

📸 Bonus: The project also included installation of a whole home surge protector and free 1-year membership in Denommee’s Peace of Mind Service Program—further protecting the home’s investment.

Energy Efficiency + Rebates = Big Savings

This upgrade qualified for major energy savings:

💸 $7,125 Mass Save Instant Rebate
💸 $2,000 Federal IRS Tax Credit
⚡ Lower year-round operating costs
🛡️ Cleaner, safer operation without full reliance on fossil fuels

Hybrid systems are ideal for homeowners who want the efficiency of electric heat while maintaining a gas backup for peace of mind on sub-zero nights. It’s also a great way to transition toward full electrification at your own pace.

Why Choose Denommee for Your High-End HVAC Upgrade?

High-performance HVAC systems like these require expert planning, licensed execution, and seamless integration across HVAC, electrical, and plumbing trades. Denommee offers:

✅ One-Stop Trades Under One Roof

No third-party electricians or subcontractors. Denommee's in-house crews handle every aspect of the project—from system design and permitting to installation, wiring, and commissioning.

✅ Bosch Home Comfort Pro

As a Bosch certified installer, Denommee offers expert knowledge of Bosch IDS systems and ensures full warranty protection with factory-trained installation and setup.

✅ Mass Save Partner

Denommee is a Heat Pump Leader Network contractor, meaning they’re trusted by Mass Save to deliver high-efficiency results with maximum incentives.

✅ Concierge Project Management

Their office team coordinates all inspections, rebate paperwork, utility requirements, and timelines—so you don’t have to.

✅ Quality Control & Ongoing Service

Denommee’s system commissioning and quality control process ensures your system performs to spec from day one. And with Peace of Mind Service Memberships, homeowners receive:

Annual HVAC inspections
Priority booking
Discounted repairs
Loyalty credits for future upgrades
Text-to-book convenience

Is a Hybrid Heat Pump System Right for You?

Hybrid HVAC systems are ideal if:

Your home has an existing gas boiler or hydro-air heating system
You want to reduce energy usage and emissions
You’re eligible for rebates and tax credits
You want the quiet comfort and zoning benefits of inverter heat pumps
You’re planning to fully electrify your home over time

Denommee offers free consultations, both in person and virtual, and can even provide online pricing estimates with their HVAC System Quote Tool.

Ready to Upgrade Your Comfort?

Whether you’re building new, remodeling, or replacing aging HVAC systems, Denommee Plumbing, HVAC & Electric provides unmatched value, integrity, and performance for high-end homes across: