*The Angi rating for Generator Install companies in De Forest, 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 De Forest, 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 April 22, 2026
Serving De Forest, WI and surrounding areas
Approved
In business since 2023
Free estimates
Emergency services offered
"The crew did an excellent job. Efficient and timely and the end result is perfect!"
+1
Serving De Forest, WI and surrounding areas
Approved (Corporate)
Super Service Award Winner
In business since 1984
Free estimates
Emergency services offered
"I purchased a new HVAC system from Cardinal. Everything about the job went as planned, in the amount of time we were promised. The installers were professional and cleaned up the work space very well when they were finished. I would use Cardinal again without hesitation."
+55
Serving De Forest, WI and surrounding areas
Approved
In business since 1985
Free estimates
Customers say: Quality work
"We've had them out on 2 occasions, and we're very happy both times. Quality work, very reasonable price. Lighting and fan installation, plumbing, drywall, baseboard installation, and similar repairs were performed"
+1
Serving De Forest, WI and surrounding areas
Approved
In business since 2010
Emergency services offered
Warranties offered
"Simple project, installing a 220 Volt outlet. Again a bit of sticker shock but similar to other estimates. Affable character."
+5
Serving De Forest, WI and surrounding areas
Approved
In business since 2014
Emergency services offered
Warranties offered
"Very quick response to my initial request. Installed a ceiling fan in a new location within a week. While there, we asked them to add an outlet to a bathroom. No problem for Engelhart. Quality, timely work, and they cleaned up after!"
Serving De Forest, WI and surrounding areas
Approved
In business since 2002
Free estimates
Emergency services offered
"It went really well. Nick was responsive via email, and he was communicative throughout the process. Nick found a creative way of running power out to my garage, installed a sub panel, added five outlets on individual circuits to my garage, and ran power to my new L2 car charger. I couldn't believe how fast they were able to knock out the project. I like the way that he set things up so that we can easily expand in the future. Nick and his assistant were really nice guys with great attitudes. They worked efficiently, cleaned up after themselves, and did a really nice job. I would absolutely hire them again."
+6
Serving De Forest, WI and surrounding areas
Approved
Free estimates
Emergency services offered
Warranties offered
"Jim stopped by a few hours after contacting him to give me a quote. Karl came first thing the next morning and completed the work. Quick and easy. Both were very polite and professional. New go to for electric!"
Serving De Forest, 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 De Forest, WI and surrounding areas
Approved
In business since 2019
Free estimates
Credit card accepted
"Shawn was on time, very knowledgeable., and professional. Will call him again when our generator needs servicing."
Serving De Forest, WI and surrounding areas
Approved
In business since 2024
Free estimates
Warranties offered
"Hunter did everything in a very timely and thorough manner. He was very easy to work with. His work was top notch. He kept us updated on the project and finished it much faster than we thought it could be ton. Hunter is an extremely professional young man and I highly recommend him. If I need any electrical work done in the future my first call will be to Hunter."
+8
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.
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.
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 can tap into existing gas lines so they never run out of fuel. Here’s how they work and how they’re used.
Having a back-up power source in case of emergency is important. Here’s how to use a generator to power your house.
Traditional and inverter generators can provide off-grid or emergency power. Learn the pros and cons of a traditional generator vs. inverter generator.
