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

Avatar for Tri-State Water, Power & Air
Tri-State Water, Power & Air
4.4(
5
)
Fixed Generator - InstallGenerator - InstallGenerator - Install - For Business

Serving Diana, TX and surrounding areas

Approved (Corporate)

In business since 1992

Free estimates

Emergency services offered

We are the experts in the field of Whole Home Generator Sales and Installation, with over 20 years of experience in the game. We provide turn-key installation by licensed professionals - 24 hour emergency service - Remote Monitoring - Long term maintenance and service by factory trained technicians.

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+2

134 neighbors recently requested a quote
Avatar for Lonely Mountain Electric
Lonely Mountain Electric
5.0(
8
)
Portable Generator - Install

Serving Diana, TX and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"40 X 32ft shop. 27 conduit drops to include two 220 drops for Welder and Mini Split Technicians were very courteous, knowledgeable and professional. They answered all my questions thoroughly. After the install, they briefed on the electrical panel. Organized to perfection. I would not hesitate to hire this business again. Highly recommended. Thanks again to Mike and Chadwick, you made the experience positive. Brandon"
15 neighbors recently requested a quote
Lonely Mountain Electric
5.0(
3
)
Portable Generator - Install

Serving Diana, TX and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

Lonely Mountain Electric is committed to excellence in every aspect of our \nbusiness. We uphold a standard of integrity bound by fairness, honesty, \nand personal responsibility. Our distinction is the quality of service \nwe bring to our customers. Accurate knowledge of \nour trade combined with ability is what makes us true professionals. \nAbove all, we are watchful of our customers' interests and make their \nconcerns the basis of our business.

Hill Electric Co., LLC
3.5(
1
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Repair - For Business

Serving Diana, TX and surrounding areas

Approved

In business since 1973

Free estimates

Credit card accepted

"I would still like to hire CP, Hill, Davis or Circle S. but I don't know what to do from here. I would give them a better score If I could see their work on my home. I only marked ( would not hire them ) because there is no in-between. I have been trying to get some one to install a Transfer Switch for my new generator, I called ( Hill ) with no response then Home Advisor gave them my number and still no response. I called ( CP Electric ) with no response then Home Advisor suggested them And gave me their number. So what's the point of me calling them again. I first hire another Electrician (Circle S) he came out and gave me a bid but never showed up to do the job. I then called him three times and he never called back. I then called a fourth electrician (Davis Electric) 2 times and he never called back. This might be considered a small job but I think they should at least call you back and tell you that they can't do it for what ever reason. That's called doing good business. No disrespect to any of these businesses I'm just getting pretty frustrated trying to get something done. This is the same thing that happened when I tried to hire a roofer with Home Advisor , I still have a bad roof jack that is probably leaking water into my rafters causing damage. I have cash money and no one wants it. Is this Texas wide or just a Gilmer Problem. Never had these issue where I used to live. Home Advisor does not work at least not here."
Response time2 days
Avatar for Electrical & Lift Services of East Texas - Home  Facebook
Electrical & Lift Services of East Texas - Home Facebook
4.8(
11
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Diana, TX and surrounding areas

In business since 1989

Free estimates

Emergency services offered

"The owner, Dave Fisher, recently installed a Home Guardian Backup Generator for my home. He did a great job of helping design a system that meets my needs. The installation works perfectly and looks great. Electrical and Lift Services did an A+ job of resolving all issues associated with the install. I highly recommend this dealer for a professional generator install."
15,000-Watt Solar Array
22,000-Watt Stand-By Generator
36,000-Watt Generator
Typical Installation
Response time1 day
Recommended by100%of homeowners
Avatar for DLT Contracting, LLC
DLT Contracting, LLC
4.5(
14
)
Portable Generator - Install

Serving Diana, TX and surrounding areas

In business since 2014

Free estimates

Credit card accepted

"They remodeled our bathroom. Reconfigured the shower stall and put in tile. They put in vinyl plank flooring and a new commode. They installed gutters on the house and installed a new front door. They have a great work ethic. Easy to get along with when we changed our minds a time or two and then added some things we thought of later. They responded quickly to any issues we were concerned about. We highly recommend DLT Contracting and will be contacting them again for any future projects."
Fresh new look for apartment over garage
Attached deck BEFORE rebuild
Attached Deck AFTER Rebuild
Kitchen Remodel
Refinished Pergola - Underneath View

+5

Response time5 hrs
Recommended by90%of homeowners
Showing 1-10 of 36
Generator Install FAQs, answered by experts

It might seem counterintuitive, but installing a generator transfer switch will save you money in the long run. While you’ll have to pay between $400 and $2,500 to have the transfer switch installed, you’ll recoup that amount later on when you don’t have to pay for expensive repairs to your appliances, devices, and electrical system that may have burned out, overloaded, or stopped working due to a sudden loss of power or an incorrect hook up of a generator to your home. 

With proper maintenance, a whole-house generator can last between 20 and 40 years. The specific lifespan depends on how often and for how long the generator is used, and some models may have their life expectancy rated in hours of operation. To maximize its lifespan, expect to spend around $150 to $300 per year for annual maintenance checks from a qualified technician. During these checks, a technician will inspect the engine filter, starting mechanism, fuel, lubrication, and coolant levels. Consulting your installer and choosing a low-impact fuel like natural gas or diesel can also help ensure your generator lasts as long as possible.

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. 

Homeowners can often access federal tax credits, such as the Investment Tax Credit (ITC), which covers a percentage of installation costs. Many states and utilities offer additional rebates, grants, or performance-based incentives. These programs can significantly lower your upfront investment. Check the Database of State Incentives for Renewables and Efficiency (DSIRE) or contact your local energy office for current offers.

Whole-house generators need to be installed on level ground several feet away from walls and other objects. Because they tap into the electrical system directly, they usually need to be close to your home electrical panel for a transfer switch installation. It also helps with installation if they are near to a gas line or propane tank installation.

The Diana, TX homeowners’ guide to generator installs

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