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Avatar for LT Generators
LT Generators
4.3(
82
)

Serving Glendora, CA and surrounding areas

Approved

In business since 1995

Free estimates

Warranties offered

"The crew very polite and informative. The whole house generator installed in one day and my place was left clean. The installation project was done in a cosmetic pleasing manner and no ugly pipes or wires are visible. I was given a detailed cost of the project and kept informed at all times. It was not the lowest bid but the work was excellent and I am very happy with the finished project. The office staff are very helpful and their excellent service and detailed bid is why I chose to go with LT Generator."
22kw Generac Natural Gas Generator
27kw Generac Natural Gas Generator
Kohler Liquid Cooled
27kw Generac Natural Gas Generator
Kohler Air Cooled 20kW

+12

Response time2 days
36 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for PS Electric
PS Electric
5.0(
50
)

Serving Glendora, CA and surrounding areas

Approved

Free estimates

Warranties offered

Credit card accepted

"The best price around and the customer service was exceptional. The technician was professional and only took a couple of hours to install. Explained how everything worked and was ready to go!"
Electrical Project
Additional Photos
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Additional Photos

+21

Response time1 day
8 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for Electra-Comm, Inc.
Electra-Comm, Inc.
4.7(
70
)

Serving Glendora, CA and surrounding areas

Approved

In business since 1993

Free estimates

Emergency services offered

"Ryan, Samantha and Jesus were really easy to work with. They helped me work through installing an EV charging station and to process getting a rebate with LADWP. Ryan helped me understand the process and how the EV install works, plus get permits! I couldn't be happier!"
Solar paneling
Scissor lift
Electrical box and panel
Installing recessed lighting
Response time5 hrs
Recommended by98%of homeowners
Avatar for Albrik Electric Co.
Albrik Electric Co.
5.0(
19
)

Serving Glendora, CA and surrounding areas

Approved

In business since 2021

Free estimates

Offers commercial services

"Albrik Electric Co was contracted out as a 3rd party to complete an installation for a business client. The former electrical contractor was let go and Albrik Electric Co stepped in to resume the work. Between the ease of communication, the quality of work, flexibility of work time, and fair pricing, I highly recommend using Albrik Electric Co. We will consider using this company again for future projects."
Response time9 hrs
Response rate100%
3 neighbors recently requested a quote
Avatar for Casaroja Electric Inc
Casaroja Electric Inc
5.0(
18
)

Serving Glendora, CA and surrounding areas

Approved

Emergency services offered

Warranties offered

Offers commercial services

"Sergio did a fantastic job! Very happy with the clean install of my tier 2 charger and he added a plug down below my panel. Would recommend for any sort of EV charging installs! Clear communicator, showed up when he said he would and his services were well-priced!"
Panel upgrade
Panel upgrade
Panel upgrade
Panel upgrade
Panel upgrade

+1

5 neighbors recently requested a quote
Martin's Electrical & Lighting Company
4.8(
100
)

Serving Glendora, CA and surrounding areas

Approved

In business since 1996

Free estimates

Emergency services offered

"The whole process, from estimate to follow-up service, was superb. There was an issue with the installed timer. A simple request and the replacement was scheduled for replacement within a week at no charge. A request for an upgrade was also done quickly for a small charge. I highly recommend Martin!"
New Samsung Flat Panel!!
 Recess Lights
 Smart Phone this Code for Specials!!!
 Kitchen Lighting
Flat Panel TV

+15

Recommended by98%of homeowners
Avatar for All Electrical Services
All Electrical Services
4.7(
35
)

Serving Glendora, CA and surrounding areas

Approved

In business since 1993

Free estimates

Emergency services offered

"Upon providing a thorough work order and price detail, Emin and his employees came on time the next day to start the project the whole house grounding and EV charger installation. Employees are certified and very knowledgeable, did a great job overall. Will hire again for future project!"
Additional Photos
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Additional Photos
Additional Photos
Response time8 hrs
Response rate99%
1 neighbors recently requested a quote
Avatar for ZERO ELECTRIC
ZERO ELECTRIC
4.9(
10
)

Serving Glendora, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Credit card accepted

"Highly Recommended! We have hired Zero Electric to do several jobs at our apartment complex including installing a generator, EV chargers, new panel, and even installing recessed lighting in the units. They handled all aspects of the projects and had top notch communication throughout. The team has always been quick and professional. We will continue using Zero Electric for our electrical needs."
Additional Photos
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Additional Photos

+1

2 neighbors recently requested a quote
Recommended by70%of homeowners
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Generator Install questions, answered by experts

Yes, in some locations, it is required by the National Electric Code (NEC) to have a transfer switch installed for electrical emergencies. In addition to following electrical code, generator transfer switches ensure your home is fully protected during a power outage. By switching the power from the main breaker to the generator breaker, you can seamlessly operate your HVAC, lights, appliances, devices, and more during an emergency. 

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

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.

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.

A 1,500 square foot home will likely need a 15kW to 20kW generator. When deciding on whole-house generator size, add up the total wattage of the devices that you’d like to continue running during a power outage. That way, you can ensure you purchase a generator that can power your necessary appliances or medical equipment during an electrical emergency.

The Glendora, CA homeowners’ guide to generator installs

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