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Avatar for LT Generators
LT Generators
4.3(
82
)

Serving Altadena, 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 Power Up Electric Inc
Power Up Electric Inc
4.8(
648
)

Serving Altadena, CA and surrounding areas

Approved

In business since 1983

Free estimates

Warranties offered

"Andrew is the best! He went above and beyond to help us fix two more issues we found during the electrical outlet installation. And he is very knowledgeable and honest at his work and we would definitely use him again and highly recommend everyone to use Andrew for any electrical needs. Thanks again for all your help Andrew!"
Additional Photos
Additional Photos
Additional Photos
Response time3 hrs
2 neighbors recently requested a quote
Recommended by94%of homeowners
JK Flores Enterprise LLC.
5.0(
37
)

Serving Altadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Emergency services offered

"Perfect and smooth journey, Jorge came pre instillation to check the electrical panel and where the the charger was going to be installed and after the review he text me the cost of parts and installation, after I received the charger he came on time and the job was completed. I was updated by text messages throughout the process. In the future if I need any electrical work I definitely use JK Flores Enterprise."
Existing ceiling fan
UPS system ready for a power outage
e.v. charger
New ceiling fan in living room
New UPS system

+28

Response time4 hrs
Response rate95%
4 neighbors recently requested a quote
FRANCIS
4.9(
116
)

Serving Altadena, CA and surrounding areas

Approved

In business since 2012

Free estimates

Customers say: Quick response

"Francis returned my inquiry within 30 minutes and asked questions about the job at hand. We set up an appointment for him to look at the job (installation of chandelier) later that evening. He came to the house and quoted me and I was surprised that he was ready to install the same night. Francis did an excellent job with the chandelier intallation and was very professional. I look forward to hiring him again. Stop looking and contact Francis for your electrical needs!"
Response time3 hrs
Response rate92%
3 neighbors recently requested a quote
Avatar for Garafano Electric, Inc.
Garafano Electric, Inc.
4.8(
188
)

Serving Altadena, CA and surrounding areas

Approved

In business since 1968

Free estimates

Warranties offered

"William and his team did a fantastic job upgrading our meter panel. They took care of all the permits and had the job done on time and on schedule. They were extremely communicative throughout the entire process and I would use them for all electrical services in the future."
Response time3 days
6 neighbors recently requested a quote
Recommended by98%of homeowners
Avatar for JOHNSON ELECTRIC
JOHNSON ELECTRIC
4.7(
244
)

Serving Altadena, CA and surrounding areas

Approved

In business since 1977

Free estimates

Warranties offered

"Mr. Johnson and his crew have performed a fewjobs from lighting installations, to doorbell repair, to rewiring. Every job has been done well and at a reasonable price. The workers were respectful and very helpful at explaining the work they did before they left. What really set this outfit apart is Mr. Johnson himself. He always returns calls, his crews show up on time and perform the work expediently. On top of this, when I have had questions about other electrical concerns, Mr. Johnson takes time to have a phone call to consult on the issue. Mr. Johnson and his company are of high integrity and I would highly recommend them for any residential electric work."
Additional Photos
Additional Photos
Additional Photos
Response time6 hrs
4 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Electra-Comm, Inc.
Electra-Comm, Inc.
4.7(
70
)

Serving Altadena, 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 Altadena, CA and surrounding areas

Approved

In business since 2021

Free estimates

Offers commercial services

"I recently had Narek install a Tesla wall connector in my garage in Los Angeles, and I could 't be happier with the service I received. Narek was not only professional and knowledgeable, but he also got the permit required for the installation very quickly. He arrived on time and took the time to explain the installation process and answer any questions I had. The installation itself was done quickly and efficiently, and Narek made sure to clean up after himself once the job was complete. He also took the time to show me how to use the wall connector and ensure that it was working properly before he left. Overall, I would highly recommend Narek to anyone looking to install a Tesla wall connector. His professionalism, attention to detail, and expertise made the process easy and stress-free, and I am thrilled to now have a reliable and efficient way to charge my electric vehicle at home."
Response time9 hrs
Response rate100%
3 neighbors recently requested a quote
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Generator Install questions, answered by experts

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.

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.

The cost to install a whole-house generator averages $5,200, with a typical price range of $1,500 to $8,900. However, total costs can vary from $400 for a small portable unit to over $18,000 for a large-capacity system. The most significant cost factor is the generator's size and capacity, but other variables include the brand, fuel type, and labor for assembly and installation.

Generator costs can be broken down by type:

  • Portable or Emergency Backup Generators (1kW–7.5kW): $500 to $2,000

  • Partial-Home Generators (9kW–20kW): $2,000 to $6,500

  • Whole-House Generators (22kW–48kW): $5,000 to $18,000

To avoid paying for more power than you need, consider hiring an electrician to calculate the electrical load for your essential appliances. It is also recommended to get at least three quotes to find the best deal for your specific needs and budget.

Generally, you’ll want to keep between 60 and 70 feet between the generator and the transfer switch. There are a few reasons for this, including:

  • The distance reduces the noise coming from the generator into your home.

  • It increases efficiency because you won’t have a voltage drop from this short of a distance.

  • Prevents carbon monoxide poisoning: keep at least 15 feet between your generator and an open window. 

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.

The Altadena, CA homeowners’ guide to generator installs

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