Project Summary
Project Type
Furnace and AC Installation
Location
Marin County, CA
Duration
2 Days (Completed Ahead of Schedule)
Services Provided
- High-Efficiency Furnace
- AC Unit
- Smart Thermostat
- Ductwork Modification
When a Marin County homeowner needed an new HVAC system installed to replace their outdated furnace AC and old brown floor registers, they turned to Bellows Plumbing, Heating, Cooling & Electrical for a comprehensive HVAC upgrade. While the existing equipment was still functional, it lacked the energy efficiency, quiet operation, and smart technology that modern systems offer. Our mission: install a high-efficiency furnace and AC system that would deliver reliable year-round comfort, optimized performance, and full compliance with current building codes.
Project Scope & Key Components
This HVAC system replacement project involved removing and upgrading both the forced air unit (FAU) and the air conditioning system, along with turning the ductwork and controls:
- Furnace Replacement:
- Removed existing 80% AFUE single-stage horizontal FAU from the crawl space
- Installed 3-ton Lennox ML196 high-efficiency furnace
- Added horizontal “B” cabinet coil and condensate pump
- Air Conditioner Upgrade:
- Removed old AC and installed 3-ton ML17XC1 AC unit on the left side of the home
- Ran new 35-foot refrigerant lineset
- Integrated system with existing electrical
- Ductwork & Controls:
- Replaced all 9 supply registers, tying to existing 9 supply ducts and 1 return duct
- Sealed system to pass HERS testing
- Installed new EcoBee smart thermostat
Installation Phases & Timeline
When evaluating the value of this HVAC system replacement, it’s clear that the benefits go far beyond just replacing old equipment. From improved comfort and energy efficiency to smarter home control and long-term reliability, this installation checked every box for performance and peace of mind. Here’s how this system made a meaningful impact:
Day 1: System Removal & Site Prep
- Removed the old indoor and outdoor HVAC units
- Prepped and attached most of the ductwork to the new supply plenum
- Ran a new service light and fixed an electrical switch in the crawl space
- Installed the new furnace and coil on stands
- Prepped the gas trap and wiring
- Sealed the new supply plenum
- Cleaned the worksite and ensured it was safe for Day 2
Day 2: System Installation & Finalization
- Completed installation of furnace and AC system
- Ran a new lineset and drain line with pump
- Installed new flue pipe using 2-inch PVC for proper venting
- Fabricated and installed new return and supply plenums
- Rerouted existing supply ductwork for improved efficiency
- Replaced all floor registers
- Installed new EcoBee thermostat and programmed settings
- Added a plug-in fuse (SRU) and updated gas piping to meet current code
Final Results & Homeowner Feedback
This project was completed on schedule, thanks to our team’s efficiency and coordination. The new HVAC system passed all code requirements and HERS testing, and the customer reported immediate improvement in comfort and system performance.
The project was completed in just two days by a two-person crew, minimizing disruption to the household.
The homeowner was especially pleased with the upgraded thermostat, quieter system operation, and the clean, professional workmanship throughout the process.
Photo Highlights
Want to get a closer look at the craftsmanship behind this HVAC system replacement? Below are photos showcasing key moments from the installation process-from the crawlspace prep and furnace stand setup to the final thermostat configuration and outdoor AC unit placement. These images capture the attention to detail and professionalism that define every Bellows installation.
System Benefits & performance Impact
A high-efficiency HVAC system replacement provides substantial benefits for homeowners:
- Improved comfort: The Lennox ML196 furnace and ML17XC1 AC unit deliver more consistent temperatures, which the customer noticed immediately.
- Lower utility costs: The higher efficiency rating compared to the old 80% AFUE model reduces energy consumption during heating seasons.
- Quieter home environment: The customer specifically noted reduced noise levels with the new system.
- Smart temperature control: The EcoBee smart thermostat provides programmable settings for additional convenience and efficiency.
- Safety and compliance: The system meets all current building codes and passed HERS testing.
- Longer system life: Modern equipment with proper installation (new flue pipe, condensate pump, sealed ductwork) typically outlasts older units.
With reduced maintenance demands and significantly lower energy bills, the homeowners now enjoy a more comfortable, cost-efficient lifestyle year-round, thanks to our heating and cooling services.
