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Avatar for Casaroja Electric Inc
Casaroja Electric Inc
5.0(
19
)

Serving Diamond Bar, 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
Avatar for Quality Electric Corp
Quality Electric Corp
5.0(
17
)

Serving Diamond Bar, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2014

Free estimates

Credit card accepted

"Quinn was professional and courteous. In addition to the EV charger installation, he also installed 2 new circuits with breakers and new conduit. All the work looked amazing and he and his associate cleaned up everything when they were done. Couldn’t have been happier with the work done. Would highly recommend Quality Electric."
Response time3 hrs
Response rate97%
3 neighbors recently requested a quote
Avatar for ZERO ELECTRIC
ZERO ELECTRIC
4.9(
10
)

Serving Diamond Bar, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Credit card accepted

"My experience with Zero Electric was great! James was extremely knowledgeable about home generators and walked us through several pricing options that fit our budget. Their work was clean and efficient and I will definitely be hiring him in the future for our electrical issues."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+1

1 neighbors recently requested a quote
Recommended by70%of homeowners
Avatar for Accurate Electric, Plumbing, Heating and Air
Accurate Electric, Plumbing, Heating and Air
4.5(
14
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"I worked with the owner and the field supervisor - both extremely nice & very professional. I hope I have additional work needed in the future just so that I can work with them again!"
Jeff Seale - Owner
Albert Aragon - Dispatch
Cheri Fortner - Operations Manager
Dan Hartman - Journeyman Plumber
Eric Bribiesca - Comfort Advisor

+23

15 neighbors recently requested a quote
Recommended by81%of homeowners
Trout Electric
4.3(
20
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"The electricians installed two outlets and one LED light fixture in a very professional manner. They provided good advice and suggested that I consider rejunvenating my electrical panel as my home is now 26 years old without pressuring me to have it done immediately. I will definitely consider Trout Electric when I decide to have it done."
Recommended by88%of homeowners
Avatar for Orozco's Electric, Inc.
Orozco's Electric, Inc.
5.0(
5
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 2023

Emergency services offered

Small jobs welcome

"Very satisfied with upgrading a 100amp residential electrical panel to 200amp. Benjamin and his crew came out to review a 40+ year old panel and his bid laid out everything he thought needed to be done. His bid was similar/competitive with the other two I received, but as with anything like this, some extra costs did materialize after discussions with Edison and City of Long Beach; he explained all of these and got my sign off on everything he did/added, and at the end he kept the extra costs as low as possible. Benjamin’s communication was great and he tried to explain everything to me - the novice. During the “rough inspection” the inspector said “this is probably the cleanest and most organized residential panel project I’ve ever seen”. They also did a nice job of covering the old service mast and panel/meter box and cleaning up after the project. Orozco's will be coming back for some other work inside my house and I will probably eventually bring them back for some upgrades"
Panel Layout
Panel Progress
More Panel Progress
Main Water Bond
Response time4 hrs
Response rate95%
5 neighbors recently requested a quote
Advance Electric
4.3(
11
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 2009

Free estimates

Credit card accepted

"Ricardo is the best electrician I?ve ever hired. Was very professional and friendly to talk to. Honest pricing for a meter panel upgrade. Did what he said he was going to. Also checked out some lighting fixtures I wanted to get installed in my home as I?ve had several quotes and they were just outrageously priced but he gave me the best price out of 6 electricians! Will definitely hire Rick for all my future electrical needs!!"
Response time10 hrs
3 neighbors recently requested a quote
Recommended by50%of homeowners
Avatar for M.D.H. Builders/Design/Development
M.D.H. Builders/Design/Development
5.0(
7
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"I had an amazing experience with MDH Roofers! From start to finish, they were professional, efficient, and thorough. The team showed up on time, worked diligently, and left my property spotless once the job was done. The quality of the roofing work exceeded my expectations. They took the time to explain the process and answered all my questions patiently, making me feel confident in their expertise. I could not be happier with the result my new roof looks fantastic! If you re looking for a trustworthy and skilled roofing company, I highly recommend MDH Roofers."
New Build
New Build
New Build
New Build
New Build

+32

Response time12 hrs
Response rate96%
98 neighbors recently requested a quote
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Generator Install questions, answered by experts

Whole-house generators can run continuously for extended periods, even for weeks at a time (around 400 to 500 hours), as long as they have a sufficient fuel supply. However, this type of extensive use will increase wear and tear and can shorten the generator's overall lifespan. During long periods of operation, it's important to check and refill the engine oil as needed, potentially as frequently as daily depending on the model. If your generator uses a fuel tank, ensure it is kept full to prevent unexpected shutdowns.

Yes, natural gas generators can work without electricity. Natural gas generators are a common type of backup or whole-house generator that operates when the electrical grid isn’t working. The trick is using a transfer switch (which usually needs to be installed with the generator) that safely switches the home electrical system from the power grid to generator power when needed.

A 10,000-watt generator can run a small to mid-sized central AC unit (typically up to 3 tons or 36,000 BTU) along with a few other appliances. However, larger AC units or additional loads will require a bigger generator. Consult a local generator installer to ensure you add the correct size generator to your home.

If you have a transfer switch properly installed, the generator and main electrical power cannot feed the system at the same time. However, you should still shut off the power at your main circuit breaker panel before activating the generator. If you do that, you’ll simply need to shut off the generator and reset your circuit breaker once the local power comes back on.

While diesel is relatively stable, it won’t last nearly as long as propane and you may have to replace it if it sits unused for too long. Diesel can sometimes struggle to work efficiently or start engines during especially cold weather, so it’s not the best choice for every climate. Compared to fuels like propane and natural gas, diesel generators tend to be noisier and create more exhaust, which isn’t always ideal for home use.

The Diamond Bar, CA homeowners’ guide to generator installs

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