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  • Average homeowner rating star icon4.9
    Average homeowner rating
  • Verified reviews icon11
    Verified heating oil services reviews

Find Heating oil pros in Williams Bay

Avatar for John B Ventures LLC

John B Ventures LLC

4.88(
210
)
Approved Pro

John B Ventures LLC

4.88(
210
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
2025 years of experience

Project maintenance and installation - John B Ventures LLC is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have years of hands-on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!

"John was very nice and patient with our questions. He was very knowledgeable and did a great job. "

Jose S on November 2025

Project maintenance and installation - John B Ventures LLC is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have years of hands-on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!

"John was very nice and patient with our questions. He was very knowledgeable and did a great job. "

Jose S on November 2025


Avatar for KETTLE MORAINE HEATING & AIR CONDITIONING LLC

KETTLE MORAINE HEATING & AIR CONDITIONING LLC

4.88(
119
)
Approved Pro

KETTLE MORAINE HEATING & AIR CONDITIONING LLC

4.88(
119
)
Approved Pro
Customers say: Super punctual
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
1987 years of experience

Kettle Moraine Heating & Air Conditioning, LLC is a third-generation family-owned business that has been serving Southeastern Wisconsin for over 35 years. Our mission is to provide our customers with peace of mind and 5-star service. We specialize in air conditioning, furnaces, boilers, ductless mini-splits, solar, backup generators, radon mitigation, plumbing and electrical services. Additionally, we are the region’s premier installer of Lennox energy-efficient heating and cooling systems and Mitsubishi ductless mini-split systems. With an unwavering commitment to our customers, you can count on us to deliver the personalized care you deserve. • 24/7 Emergency Service • Tune-Ups/Maintenance Plans • 0% Financing

"This company is amazing! I would recommend them 10times over. The job was gone quickly and with such precision. They care about their customers and will go to lengths that most companies, nowadays, have forgotten. The owner himself is not afraid to work hard and do what needs to be done. Sherry was beyond helpful and supportive throughout the process. If you want the job done right, this is your company."

Nichole S on November 2022

Kettle Moraine Heating & Air Conditioning, LLC is a third-generation family-owned business that has been serving Southeastern Wisconsin for over 35 years. Our mission is to provide our customers with peace of mind and 5-star service. We specialize in air conditioning, furnaces, boilers, ductless mini-splits, solar, backup generators, radon mitigation, plumbing and electrical services. Additionally, we are the region’s premier installer of Lennox energy-efficient heating and cooling systems and Mitsubishi ductless mini-split systems. With an unwavering commitment to our customers, you can count on us to deliver the personalized care you deserve. • 24/7 Emergency Service • Tune-Ups/Maintenance Plans • 0% Financing

"This company is amazing! I would recommend them 10times over. The job was gone quickly and with such precision. They care about their customers and will go to lengths that most companies, nowadays, have forgotten. The owner himself is not afraid to work hard and do what needs to be done. Sherry was beyond helpful and supportive throughout the process. If you want the job done right, this is your company."

Nichole S on November 2022


Avatar for ThermaTek Heating and Air

ThermaTek Heating and Air

4.73(
325
)
Approved Pro

ThermaTek Heating and Air

4.73(
325
)
Approved Pro
Super Service Award
Customers say: Quick response
2018 years of experience
Free onsite estimate

Welcome to ThermaTek Heating and Air. We are excited to exceed your expectations! As industry professionals, we will handle all your needs with the high-quality expertise and attention to detail your home or business deserves. We offer competitive prices and customer satisfaction is our number one priority. Call us today for your free estimate!

"The technicians were friendly, professional, and communicated clearly. The price is reasonable priced and the service is fast. We will continue to use this provider for maintenance and future appliance repairs and replacements. "

Gardiner O on December 2025

Welcome to ThermaTek Heating and Air. We are excited to exceed your expectations! As industry professionals, we will handle all your needs with the high-quality expertise and attention to detail your home or business deserves. We offer competitive prices and customer satisfaction is our number one priority. Call us today for your free estimate!

"The technicians were friendly, professional, and communicated clearly. The price is reasonable priced and the service is fast. We will continue to use this provider for maintenance and future appliance repairs and replacements. "

Gardiner O on December 2025


Avatar for Fab Tek Custom Sheet Metal & HVAC, LLC

Fab Tek Custom Sheet Metal & HVAC, LLC

4.94(
9
)
Approved Pro

Fab Tek Custom Sheet Metal & HVAC, LLC

4.94(
9
)
Approved Pro
Customers say: Quick response
2019 years of experience
Free onsite estimate

An HVAC system that works well ensures you get better performance that remains easy on the energy costs. Let our team optimize your property. When you hire us, you can always expect quick project completion and quality of work that generates lasting results. FabTek Custom Sheet Metal & HVAC is there when you need us. We serve Milton & Janesville and the surrounding areas and are available Monday-Friday, from 8:00 a.m.-5:00 p.m. Call us for a written estimate and learn how we will improve your property.

"I couldn't be more thrilled with the service I received from Mark at Fabtek! From the very first consultation to the final installation of my new AC unit and furnace, Mark delivered top-tier professionalism, craftsmanship, and care. He took the time to walk me through all my options, answered every question patiently, and made sure I felt confident in my choices. The installation itself was smooth, efficient, and done to perfection. You can tell Mark takes great pride in his work—everything looks clean, functions flawlessly, and was completed right on schedule. He even went above and beyond to ensure the space was tidy when he finished. And the pricing? Incredibly affordable, especially considering the quality of work and equipment. No hidden fees, no surprises—just honest, excellent service. If you're looking for someone dependable, skilled, and fairly priced, look no further than Mark at Fabtek. Highly recommended! "

LYLE M on July 2025

An HVAC system that works well ensures you get better performance that remains easy on the energy costs. Let our team optimize your property. When you hire us, you can always expect quick project completion and quality of work that generates lasting results. FabTek Custom Sheet Metal & HVAC is there when you need us. We serve Milton & Janesville and the surrounding areas and are available Monday-Friday, from 8:00 a.m.-5:00 p.m. Call us for a written estimate and learn how we will improve your property.

"I couldn't be more thrilled with the service I received from Mark at Fabtek! From the very first consultation to the final installation of my new AC unit and furnace, Mark delivered top-tier professionalism, craftsmanship, and care. He took the time to walk me through all my options, answered every question patiently, and made sure I felt confident in my choices. The installation itself was smooth, efficient, and done to perfection. You can tell Mark takes great pride in his work—everything looks clean, functions flawlessly, and was completed right on schedule. He even went above and beyond to ensure the space was tidy when he finished. And the pricing? Incredibly affordable, especially considering the quality of work and equipment. No hidden fees, no surprises—just honest, excellent service. If you're looking for someone dependable, skilled, and fairly priced, look no further than Mark at Fabtek. Highly recommended! "

LYLE M on July 2025


Avatar for Master Services, Inc.

Master Services, Inc.

4.39(
44
)
Approved Pro

Master Services, Inc.

4.39(
44
)
Approved Pro
Customers say: Super punctual
1990 years of experience
Free onsite estimate

Master Services is a world-class provider of residential home services such as: Plumbing, Heating, Air Conditioning, Indoor Air Quality and Drain Cleaning. These Products and services are for improving comfort, reliability, peace of mind, plus cleaner, fresher, and healthier homes. In addition to scheduled service checks, repairing of existing equipment, and installation of new equipment, we can help you find ways to reduce your energy bills through a thorough cost-benefits analysis. We have an extensive history of repair service on all brands of plumbing, central air conditioning and heating systems. Master Services, Inc provides quality workmanship with professional, dependable, and courteous service with our "Fixed Right or It's FREE!"™ We offer 24-hour emergency service so that you can count on us to be there when you need us the most. Our certified technicians use state-of-the-art technology to diagnose and repair existing systems and always use the finest new equipment for installations in the industry. Furthermore, we have a patented Straight Forward Pricing Guide™ so you know what the price is before we do the work and you are never charged by the hour. How many companies are willing to show you their price books? You can count on Master Services to do the job right. We service all brands of plumbing, heating and air conditioning equipment.

"Master Services installed a new gas furnace for us 3 years ago. We have had them come each year since to check our furnace . Each technician has been very knowledgeable. Recently our thermostat failed and they were quick to schedule us in and replace. Very happy with their response."

Diane B on November 2025

Master Services is a world-class provider of residential home services such as: Plumbing, Heating, Air Conditioning, Indoor Air Quality and Drain Cleaning. These Products and services are for improving comfort, reliability, peace of mind, plus cleaner, fresher, and healthier homes. In addition to scheduled service checks, repairing of existing equipment, and installation of new equipment, we can help you find ways to reduce your energy bills through a thorough cost-benefits analysis. We have an extensive history of repair service on all brands of plumbing, central air conditioning and heating systems. Master Services, Inc provides quality workmanship with professional, dependable, and courteous service with our "Fixed Right or It's FREE!"™ We offer 24-hour emergency service so that you can count on us to be there when you need us the most. Our certified technicians use state-of-the-art technology to diagnose and repair existing systems and always use the finest new equipment for installations in the industry. Furthermore, we have a patented Straight Forward Pricing Guide™ so you know what the price is before we do the work and you are never charged by the hour. How many companies are willing to show you their price books? You can count on Master Services to do the job right. We service all brands of plumbing, heating and air conditioning equipment.

"Master Services installed a new gas furnace for us 3 years ago. We have had them come each year since to check our furnace . Each technician has been very knowledgeable. Recently our thermostat failed and they were quick to schedule us in and replace. Very happy with their response."

Diane B on November 2025


Avatar for S.R.M Contracting

S.R.M Contracting

3.94(
16
)
Approved Pro

S.R.M Contracting

3.94(
16
)
Approved Pro
Customers say: Quality work
Free onsite estimate
Emergency services offered

S.R.M CONTRACTING has been in business for the last 3 years. Any job I take on. I work at it as if I was working on my own stuff. I am honest and to the point. I will not waste your money or my time. We have the experience and dedication to get the job done right! We guarantee your satisfaction, and we won't leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Call or click for your FREE estimate today!

"No-show. He forgot."

Erik S on October 2025

S.R.M CONTRACTING has been in business for the last 3 years. Any job I take on. I work at it as if I was working on my own stuff. I am honest and to the point. I will not waste your money or my time. We have the experience and dedication to get the job done right! We guarantee your satisfaction, and we won't leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Call or click for your FREE estimate today!

"No-show. He forgot."

Erik S on October 2025


Avatar for Walnut Creek Designs Inc.

Walnut Creek Designs Inc.

5.00(
2
)
Approved Pro

Walnut Creek Designs Inc.

5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
2021 years of experience

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction, from the start to the completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

"I originally contacted Jay Cope of Abate Retoration. I had water coming in my basement from a crawlspace and basement windows, that I had another party attempt to fix. Adrian and Jay work together. These guys are amazing. The stiuation was analyzed, and quoted in a few days time. I was sold on the service the first day. They also did an encapsulation and covering of 9" tiles on an upstairs floor. They worked super hard and put in long days, as I had an environmental inspection deadline to meet. I would certainly recommend their services to anyone. Thanks so much to these 2 guys and their crew members. After running my own service business for almost 40 years, I am very pleased to have been served the way I did my cusomers."

Bill S on March 2023

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction, from the start to the completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

"I originally contacted Jay Cope of Abate Retoration. I had water coming in my basement from a crawlspace and basement windows, that I had another party attempt to fix. Adrian and Jay work together. These guys are amazing. The stiuation was analyzed, and quoted in a few days time. I was sold on the service the first day. They also did an encapsulation and covering of 9" tiles on an upstairs floor. They worked super hard and put in long days, as I had an environmental inspection deadline to meet. I would certainly recommend their services to anyone. Thanks so much to these 2 guys and their crew members. After running my own service business for almost 40 years, I am very pleased to have been served the way I did my cusomers."

Bill S on March 2023


Avatar for Sears Home Services of Milwaukee

Sears Home Services of Milwaukee

5.00(
1
)
Approved Pro

Sears Home Services of Milwaukee

5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
1992 years of experience

Sears Home Services has helped consumers transform their homes for over 100 years. Trust our experts to replace, repair or maintain your heating and cooling systems. Right now, you can save $325 on a new HVAC purchase of $1,500 or more. Restrictions apply. And, if you need HVAC repair or maintenance, ask about our HVAC Savings Program. Every paid HVAC repair and maintenance service with Sears Home Services earns you dollar for dollar savings towards your next HVAC replacement, up to 10% of your new unit purchase price.

"They were on-time, and went above and beyond to make sure everything was addressed."

William B on January 2018

Sears Home Services has helped consumers transform their homes for over 100 years. Trust our experts to replace, repair or maintain your heating and cooling systems. Right now, you can save $325 on a new HVAC purchase of $1,500 or more. Restrictions apply. And, if you need HVAC repair or maintenance, ask about our HVAC Savings Program. Every paid HVAC repair and maintenance service with Sears Home Services earns you dollar for dollar savings towards your next HVAC replacement, up to 10% of your new unit purchase price.

"They were on-time, and went above and beyond to make sure everything was addressed."

William B on January 2018


Sears Home Services- Milwaukee HVAC

New on AngiNew on Angi
Approved Pro

Sears Home Services- Milwaukee HVAC

New on AngiNew on Angi
Approved Pro
1893 years of experience

Transform Home Improvements has been helping homeowners turn their improvement dreams into reality for more than 20 years. We provide a complete remodel solution, from selecting and ordering materials to installation and beyond with expert, dedicated support every step of the way. Need a complete overhaul or just updating your shower or vanity? With our robust financing options* and a full catalog of material selections to meet every budget, schedule your no-obligation in-home consult to see just how affordable your dream bathroom can be. Every project comes with our satisfaction guarantee and applicable multi-year warranties. Make this your easiest improvement project yet with Transform Home Improvements.

Transform Home Improvements has been helping homeowners turn their improvement dreams into reality for more than 20 years. We provide a complete remodel solution, from selecting and ordering materials to installation and beyond with expert, dedicated support every step of the way. Need a complete overhaul or just updating your shower or vanity? With our robust financing options* and a full catalog of material selections to meet every budget, schedule your no-obligation in-home consult to see just how affordable your dream bathroom can be. Every project comes with our satisfaction guarantee and applicable multi-year warranties. Make this your easiest improvement project yet with Transform Home Improvements.


Avatar for Sentri Homes

Sentri Homes

New on AngiNew on Angi
Approved Pro

Sentri Homes

New on AngiNew on Angi
Approved Pro
2023 years of experience
Free onsite estimate

Sentri Homes is a full-service contractor delivering high-end home additions, whole-home remodels, new custom builds, luxury kitchens, structural framing, roof replacements, and every major renovation. We assign a dedicated project manager to every job, deliver meticulous craftsmanship with clear communication, and back our work with an industry-leading warranty to ensure complete peace of mind on your largest investments. Our in-house team of licensed builders and master craftsmen consistently earns 5-star reviews by turning big visions into stunning, high-value homes—when you need one trusted partner who truly does it all, we’re the proven choice.

Sentri Homes is a full-service contractor delivering high-end home additions, whole-home remodels, new custom builds, luxury kitchens, structural framing, roof replacements, and every major renovation. We assign a dedicated project manager to every job, deliver meticulous craftsmanship with clear communication, and back our work with an industry-leading warranty to ensure complete peace of mind on your largest investments. Our in-house team of licensed builders and master craftsmen consistently earns 5-star reviews by turning big visions into stunning, high-value homes—when you need one trusted partner who truly does it all, we’re the proven choice.

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Heating Oil questions, answered by experts

NATE-certified technicians may charge slightly higher service fees compared to non-certified technicians. This is because NATE certification signifies a higher level of expertise and professionalism, often leading to more efficient and effective HVAC repairs and installations. While the upfront cost may be marginally higher, NATE-certified technicians can potentially save you money in the long run by reducing energy consumption, preventing frequent breakdowns, and extending the life span of your HVAC system. When looking for a local HVAC company to hire, it never hurts to ask about NATE certifications.

Costs depend on system age, type, labor, and whether part replacements are necessary.

Leaks, poor airflow, reduced efficiency, and loop blockages are common problems requiring service.

You can expect a geothermal system to last for years. According to the Department of Energy, the underground infrastructure for the heat pumps lasts about 25 to 50 years, which includes the pipes buried in the soil. The actual heat pump itself has a life span of around 25 years.

There are three main types of heat pumps. An air-source heat pump system is the most common and has two parts—an indoor air handler unit and an outdoor heat pump unit. A ductless heat pump system functions similarly to an air-source heat pump system but doesn’t need ductwork to distribute the air. A geothermal heat pump system pulls heat from the ground to help heat your home.

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