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Top-Rated Generator install pros in Tullahoma - Updated Nov 2026

Avatar for MidSouth Electric, Inc.
MidSouth Electric, Inc.
4.4(
15
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+2 more

Serving Tullahoma, TN and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"It wasn’t just that the two contractors did a superb job on installing a line from my pool power box to my workshop; it was all the extra service they provided which really made a difference: 1. Helping me find a problem in socket within my kitchen and then follow-up on fixing related “anomalies” from my work on that socket 2. Taking time to trouble shoot garage door opener that had plagued me for weeks. 3. Retuning to replace a breaker that had blown when I incorrectly hooked up wire within my shop. All at no extra charge. Thanks, guys"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+1

Response time2 days
Response rate100%
16 neighbors recently requested a quote
Avatar for Garcia Electric
Garcia Electric
5.0(
10
)
Portable Generator - Install

Serving Tullahoma, TN and surrounding areas

Approved

In business since 2024

Customers say: True professional

"Garcia Electric is great to work with...especially as a landlord. I didn't have to be present for the repairs and was able to pay over the phone. Same day service and fair prices. I will use the again for sure."
panel upgrade
panel upgrade ( finished)
Can Lights install
Rough in switch wires
Can lights trim

+17

Response time4 hrs
Response rate96%
36 neighbors recently requested a quote
Avatar for Hiller Plumbing, Heating, Cooling, & Electrical
Hiller Plumbing, Heating, Cooling, & Electrical
4.5(
38
)
Fixed Generator - InstallFixed Generator - Repair

Serving Tullahoma, TN and surrounding areas

Approved (Corporate)

In business since 1990

Free estimates

Small jobs welcome

Hiller Plumbing, Heating, Cooling, & Electrical, established in 1990, stands for quality and reliability. With our 'Happy You'll Be or the Service is Free' guarantee, we are dedicated to customer satisfaction in Murfreesboro and the surrounding communities. Our plumbers provide emergency repairs, sewer line service, and expert installation or repair of water heaters. Our HVAC specialists ensure your comfort with preventative maintenance, air conditioning and furnace repairs, for year-round comfort. Our licensed and insured electricians offer prompt emergency response, custom upgrades, and safe, thorough electrical fixes for both residential and commercial properties. Hiller is your trusted provider for all your home service needs.

My jobs
My jobs
My jobs
My jobs
My jobs

+14

Recommended by94%of homeowners
Avatar for Coolray of Tennessee, LLC
Coolray of Tennessee, LLC
5.0(
1
)
Fixed Generator - Install

Serving Tullahoma, TN and surrounding areas

Approved

In business since 1966

Free estimates

Warranties offered

Coolray has been keeping homes comfortable since 1966 and provides expert heating & air conditioning, plumbing and electrical service to the Nashville metro area. While the technology of home comfort has changed, our purpose is enduring and clear: to keep your home comfortable, efficient, and secure. \n \nAt Coolray, our electrical department is staffed with highly trained, licensed electricians dedicated to providing safe, reliable, and efficient services. We specialize in electrical repairs, servicing, and installations, ensuring every job meets the highest standards of quality and safety.

Coolray Electrician
Coolray Electrician
Coolray Electrician
HVAC Tools
Coolray Plumber

+2

Response time20 mins
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Generator Install FAQs, answered by experts

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

Sizing a generator is a careful process that requires calculating the electrical load of your entire house. You have to take into account every device you want to use and their wattage requirements, plus the wattage needed to start them, and look for a generator that can safely run all that at around 80% capacity.

In more practical terms, a small home can run on a 10,000-watt generator (and if you only want to power a few key appliances, much less than that). A mid-sized home may need something between 15,000 and 22,000 watts. Larger homes require 25,000 watts or more. 

You can expect a diesel generator to last for up to 30,000 hours of use, which works out to 20 to 25 years with the proper maintenance, of course. That depends on how much you use it, so a diesel generator used for emergencies a couple of times a year will last a lot longer than a generator that takes over for a faulty electrical grid every month for a day or two. 

Many services include assembling the unit and securing it in the window. Confirm with your provider.

A home that is 2,500 square feet will likely need a 20kW to 25kW generator. Consult your local generator installer to confirm the generator size needed to power your home before purchasing a new one. Be sure to consider how much power your necessary devices need to run.

The Tullahoma, TN homeowners’ guide to generator installs

From average costs to expert advice, get all the answers you need to get your job done.