*The Angi rating for Generator Install companies in Sullivan, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.
*The HomeAdvisor rating for Generator Install companies in Sullivan, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.
Last update on August 26, 2025
Serving Sullivan, WI and surrounding areas
Approved
In business since 2016
Free estimates
Credit card accepted
"Fantastic! Solved our outdoor electrical mystery. Highly recommend."
Serving Sullivan, WI and surrounding areas
Approved
In business since 1983
Emergency services offered
Warranties offered
"Everything went great. I think they did the best install they could to give me a quality job."
+9
Serving Sullivan, WI and surrounding areas
Approved
In business since 2023
Free estimates
Emergency services offered
"I cannot say enough great things about Jamie and the team at Wisconsin Generators LLC. From the very first conversation, Jamie was professional, knowledgeable, and incredibly responsive. He took the time to walk me through all my options, answered every question thoroughly, and made sure I felt confident in the decision we were making. The installation process was seamless. The crew showed up on time, worked efficiently, and treated our property with respect. Their attention to detail and commitment to doing the job right was obvious from start to finish. Everything was clean, organized, and completed exactly as promised. What really sets Jamie apart is his integrity and customer-first approach. There was no pressure just honest recommendations and clear communication. If you’re considering a standby generator, I highly recommend Jamie and Wisconsin Generators LLC. Reliable service, expert installation, and true peace of mind. Five stars all The way!!"
+1
Serving Sullivan, WI and surrounding areas
Approved
In business since 2013
Free estimates
Customers say: Quality work
"Great! Efficient, friendly, and answered any questions I had. Very happy with the fans they installed. Would reach out again!"
Serving Sullivan, WI and surrounding areas
Approved
In business since 2009
Emergency services offered
Small jobs welcome
"Got a new air conditioner and furnace installed in a day....Tyler was able to bypass the circuit board in the furnace so that we had air conditioning until they could install the new units.... very professional and timely"
+53
Serving Sullivan, WI and surrounding areas
Approved
In business since 2019
Free estimates
Warranties offered
"Installation was prompt and the solar panels have worked great so far. The phone app to track your solar production is also really good."
+16
Serving Sullivan, WI and surrounding areas
Approved
In business since 1993
Free estimates
Warranties offered
"I hired them for some electrical work at my home and was impressed right away with how straightforward and honest they were. The pricing was very fair compared to other quotes I received, and they took the time to explain exactly what I was paying for so there were no surprises. The technician arrived on time, worked efficiently, and clearly knew what he was doing. Everything was completed to a high standard, and you can tell they focus on doing quality work rather than cutting corners. It’s not easy to find someone who balances good pricing with solid workmanship, but they nailed both. Overall, great value for the money. I’d definitely recommend them to anyone looking for dependable service at a fair price, and I wouldn’t hesitate to call them again."
+3
Serving Sullivan, WI and surrounding areas
Approved
In business since 2001
Emergency services offered
Customers say: Quality work
"Excellent work. They ran electrical wiring in the attic, mounted electric boxes/switches, and installed two ceiling fans/lights. They had the right tools and knew what to do. They did the work for less than original estimate. This was for a job that one other firm (upon seeing the job) turned it down as being too difficult. I highly recommend them."
Serving Sullivan, WI and surrounding areas
Approved
In business since 2021
Free estimates
Emergency services offered
At Double U Electric, we take pride in offering every one of our customers electrical services at a fair price, while never straying away from our focus on customer service. We offer full range electrical services for anything around your home.
Serving Sullivan, WI and surrounding areas
Approved
In business since 2010
Free estimates
Offers commercial services
"Aaron/ICRA Electric did a great job on two projects for me in the Madison area. One was a whole house and panel upgrade on an older home and the second was improvements on a new home. ICRA was great tonwork with, reliable and reasonable on price and scope changes."
When maintained properly, a whole-house generator can last up to 20 years. Costs to maintain and repair generators vary by location and type of generator, but you can expect to pay about $150 to $300 per year for annual generator maintenance checks. An experienced generator service technician will inspect your generator’s engine filter, starting mechanism, fuel, lubrication, and coolant levels to keep your generator in good working condition for as long as possible.
Installing a whole-house generator costs about $5,000 on average. Prices range from $1,550 to $8,500, depending on size, brand, fuel type, and assembly. The size of your whole-house generator is the most significant cost factor, with large homes with high energy demands costing the most to power. Types of whole-home generators include:
Portable generators with 1kW–7.5kW capacity: $500–$2,000
Partial generators with 9kW–20kW capacity: $2,000–$6,300
Whole-house generators with 22kW–48kW: $5,000–$18,000
When choosing the right size generator for your needs, consider a few items to help calculate the wattage you’ll need. Start by determining which household items and appliances you want to power, and then add the wattages together. Check out the wattage of these essential appliances:
Refrigerator: 600 watts
Large dehumidifier: 700 watts
Large window air conditioner: 1,400 watts
Water heater: 3,000 watts
Running home appliances like these requires a partial or whole-house generator. A portable generator may be enough to power your home if you only plan to keep a refrigerator and freezer running.
Here’s what you can run with different wattages and types of generators:
Portable generator:
2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers.
4,000 watts will keep two large appliances operating and a few smaller devices.
8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.
Partial to whole-house generator:
20,000 watts and above will make it seem like your home’s power is still on.
The value of installing a whole-house generator is that your home has guaranteed power, even if the power grid in your area is down. Whether a whole-house generator is worth installing in your home depends on how often you use it, your home’s location, and your lifestyle. For example, installing a whole-house generator is likely worth it if you:
Experience frequent or prolonged power outages
Work from home
Store a lot of cold food
Have a sump pump
Have a pump for well water
Use electronic medical devices
Live in a climate requiring heating or cooling
From average costs to expert advice, get all the answers you need to get your job done.
The average cost of a whole-house generator falls between $5,000 and $25,000. Keep reading to learn how much you can expect to spend.
Natural gas generators are whole-home standby generators that are connected to your home’s natural gas line. The average cost for a natural gas generator is $12,000.
The cost to install a generator transfer switch depends on several factors. Our guide will help you understand all of the costs.
Say goodbye to blackouts by learning how to install a generator transfer switch. By following our guide, you’ll have a solution to nonstop power.
Traditional and inverter generators can provide off-grid or emergency power. Learn the pros and cons of a traditional generator vs. inverter generator.
Wondering who to hire to install a generator? Consult this guide to learn who to hire to install a generator or a transfer switch.
