Business Details
50+ Years
experience
Emergency
services
Your Trusted HVAC Partner in Watertown, MA
Prendergast Oil has been a trusted name in heating, ventilation, and air conditioning services since 1936. Founded by Martin R. Prendergast, our company began as a small oil delivery business and has evolved into a full-service HVAC provider. We pride ourselves on delivering quality service, with a team of certified technicians dedicated to treating every home as if it were their own. Our commitment to innovation is reflected in partnerships like our collaboration with Sensibo, offering smart climate solutions.Though we are closing in 2025 due to retirement, our legacy of personalized service and attention to detail remains unmatched. We have served communities across Middlesex and Suffolk counties, ensuring reliable comfort solutions for generations of homeowners and businesses.
Services
HVAC Installations
Oil-to-Gas Conversions
Radiant Floor Heating
Ductless A/C Systems
24/7 Emergency Service
Details
- Year established: 1936
Highlights and features
- Family-owned since 1936 with deep community roots
- Certified technicians trained in advanced HVAC systems
- 24/7 emergency service for urgent heating/cooling needs
- Competitive pricing with free on-site estimates
- Energy financing options for system upgrades
What people say
Extremely responsive and helpful
Excellent experience
Highly recommend
Spot on workmanship
Great value
Services
HVAC Installations
We specialize in complete HVAC system installations for residential and commercial properties. Our certified technicians handle oil-to-gas conversions, central air conditioning units, and modern heating systems. Every installation includes personalized consultation to ensure optimal energy efficiency and comfort for your specific space requirements.
Radiant Floor Heating
Our radiant floor heating solutions provide consistent warmth through hydronic tubing systems. Ideal for cold tile or wood floors, this service includes snow melt systems for driveways and walkways. We design custom layouts to eliminate cold spots and reduce heating costs through even thermal distribution.
Ductless A/C Systems
We install ductless air conditioning systems for homes without existing ductwork. These energy-efficient units provide targeted cooling through wall-mounted indoor heads connected to outdoor compressors. Our technicians optimize placement for maximum efficiency while maintaining aesthetic appeal and operational effectiveness.
24/7 Emergency Service
Our emergency HVAC service responds to urgent heating and cooling failures at any time. Certified technicians carry essential replacement parts and use diagnostic tools to resolve issues quickly. We prioritize restoring comfort during critical situations like winter heating failures or summer AC breakdowns.
Oil-to-Gas Conversions
We convert existing oil heating systems to natural gas or propane alternatives. This service includes equipment replacement, venting modifications, and efficiency optimization. Our team ensures compliance with local codes while maximizing energy savings and reducing environmental impact through modern fuel solutions.
People
Tom Prendergast
President
President since 1968, Tom oversees operations and customer relations. With over 50 years in HVAC, he ensures service excellence while maintaining family business values. Grandfather of four, he personally supervises major installations.
Diane Prendergast
Vice President
Vice President since 1971, Diane manages scheduling and accounting. Married to Tom since joining, she maintains customer communication while balancing administrative operations. Proud grandmother actively involved in business decisions.
Mike Russo
HVAC Technician
Senior technician since 1990, Mike specializes in system diagnostics. Chelmsford resident known for solving complex heating issues. His 30+ years of field experience ensure accurate problem identification and effective solutions for residential HVAC systems.
Steve Reilly
HVAC Installer
Expert installer since 2000, Steve transitioned from oil delivery to HVAC specialization. Belmont firefighter with technical expertise in system upgrades. Handles complex installations with attention to safety and efficiency standards in residential environments.
Harry Donoyan
HVAC Technician
Certified technician since 2004, Harry brings vocational training to field operations. Specializes in modern system installations and maintenance. Provides technical support for both residential and commercial HVAC projects with precision and reliability.
Questions
What HVAC services do you offer?
We provide complete HVAC solutions including oil/gas heating, central A/C, radiant floor systems, ductless units, installations, repairs, and 24/7 emergency service for residential and commercial properties.
Are you available for emergency service?
Yes, we offer 24/7 emergency HVAC support for urgent heating and cooling failures. Our technicians respond promptly with essential tools and replacement parts to restore comfort quickly.
Will you service my existing system?
We service all brands and ages of HVAC equipment. Our technicians can maintain, repair, or upgrade your current system regardless of original installer, ensuring optimal performance and efficiency.
What areas do you serve?
We serve most of Middlesex and Suffolk counties including Boston, Watertown, Lexington, Newton, and surrounding communities. Check our service area list for specific towns covered.
When are you closing?
Prendergast Oil & Energy will close permanently on August 8th, 2025. We are currently transitioning customers to trusted partner providers while fulfilling existing service commitments.
Do you offer financing options?
Yes, we provide low-cost energy financing for HVAC system upgrades. This allows customers to improve efficiency with manageable payment plans that often pay for themselves through energy savings.
Reviews (2)
Matt Sciandra
Nov 17, 2017
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Very responsive and willing to go the extra mile. I was initially told it would be a few days before their workload allowed them to repair my heat, but they managed to get someone to my house that afternoon and have the repair diagnosed and complete by the next afternoon. Excellent all around.
Serge Blinder
Sep 28, 2017
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Great company. Everyone from Tom Prendergast on down is pleasant, knowledgeable and keeps their commitments. Have recommended them to others and everyone feels the same way about them. Prices are competitive.
