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Best generator install pros near Longmont, CO

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

Avatar for Absolute Electrical, Heating & Cooling, LLC
Absolute Electrical, Heating & Cooling, LLC
4.3(
328
)
Fixed Generator - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2013

Free estimates

Emergency services offered

"In 2 days I had absolute out for a/c problem and to install a new attic fan system. Hector, Jovanny were the 2 main contacts for the projects. Very professional, explained what they were doing and answered any questions I had. Will definitely use absolute again."
Mini Split
Heated driveway
Furnace Inspection
Laying conduit for exterior electrical work
Electrical Panel Replacement

+34

Response time1 day
Recommended by91%of homeowners
Avatar for JL ENGINEERING SERVICES LLC
JL ENGINEERING SERVICES LLC
5.0(
18
)
Portable Generator - Repair

Serving Longmont, CO and surrounding areas

Approved

In business since 2024

Free estimates

Credit card accepted

"Back in 2024, Jesus and his team did a phenomenal job adding a new circuit/outlet in our garage for our new chest freezer and outlets with USBs for our e-bikes and other gear. He came in the morning to talk about the project and give and estimate and they were able to complete the work same day even though it was a bigger project than I’d originally described in my request. He explained the options well and was able to put everything exactly as we wanted. Very happy with how that project turned out. This year, we hired Jesus’s team again to install new light fixtures in our bathroom (vanity lights and sconces) and move some outlets. Again he and his team did a great job and were lovely to work with. We’ll be reaching out for more assistance with our bathroom reno."
10 neighbors recently requested a quote
Avatar for Just In Time Electrical Services
Just In Time Electrical Services
4.9(
32
)
Fixed Generator - InstallPortable Generator - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2019

Free estimates

Warranties offered

"Excellent experience, highly satisfied! Based on the 5 star reviews on Nextdoor, I called Just In Time Electrical to have some electrical issues fixed and new lighting added. Michael came out within a couple days to do an estimate and returned a couple days later to do the work. My home presented a few special challenges, but Michael and another technician, John, worked through them with patience and expertise, and they successfully completed all 3 projects with professionalism and to my specs. I am thrilled with the new living room recessed lighting, remote wall switch solution in another room, as well as the corrections made to my bathroom 3-way lighting. Thanks guys!"
Response time6 hrs
6 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Precision Plumbing Heating Cooling Electric
Precision Plumbing Heating Cooling Electric
4.5(
198
)
Fixed Generator - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 1982

Warranties offered

Credit card accepted

"From this experience with Precision Electrical, I can conclude that electrical is as excellent as Plumbing, which I have used for many years. If there is ever a problem with so,etching Precision has installed, they will fix it."
Response time6 days
20 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for DN Electric LTD
DN Electric LTD
5.0(
7
)
Portable Generator - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2025

Free estimates

Warranties offered

DN ELECTRIC LTD proudly serves its customers with pride, integrity and attention to the details that matter most to you. This is one of the many things that sets us apart from the rest. We are locally owned and operated. Give us a call today! \n

Electric
Basement receptacles
Basement receptacles
Basement receptacles
Basement receptacles

+1

11 neighbors recently requested a quote
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Generator Install FAQs, answered by experts

An undersized whole-house generator has the potential to overheat and shut down when you try to run a central AC system. This scenario can not only damage the whole-house generator, but can also trip your home’s breakers or cause electrical damage. To avoid this situation, hire a local generator installer to correctly size your whole-house generator.

DIY is possible for basic setups. Professional installation ensures safe and proper electrical connections.

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.

No, you should never plug a generator directly into a wall outlet in your house. This practice is extremely dangerous, often illegal, and can cause "back-feeding," where power from the generator flows back into utility lines, creating a life-threatening hazard for utility workers. It can also damage your home's electrical system, including appliances like pumps and HVAC fans. If the main power is restored while the generator is connected, it can destroy the generator and cause an electrical fire. To safely connect a generator, you must use a professionally installed transfer switch or an interlocking kit, which prevents back-feeding by disconnecting your home from the utility grid before the generator provides power.

As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

The Longmont, CO homeowners’ guide to generator installs

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