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Avatar for AMP-A-NEER
AMP-A-NEER
4.9(
28
)
Portable Generator - Install

Serving Napa, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Project: Install Electrical Switches, Outlets. They were on time, professional and flexible. Also, discussed future projects - replacing a fixture in bathroom, and on their way out attached a smog detector the right way. I would definitely use this company again."
Response time3 hrs
Response rate92%
13 neighbors recently requested a quote
Avatar for A Better Electrical Company Inc
A Better Electrical Company Inc
5.0(
12
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Napa, CA and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

"Outstanding work! I needed some rewiring done, can lights installed in the kitchen, multiple outlets and switches changed out prior to selling my house. I also had the breaker box upgraded in the garage. They did all the work with just to visits. Some items had to be ordered. Great work! Fantastic clean up! Friendly and polite! Offered me a military discount without me even asking! If I ever need electrical work again these are the folks I'm going to and you should too!"
EV Charging Station
Ceiling Fan Instal
Electrical Panel
Electrical Panel
Ceiling Fan Install

+12

4 neighbors recently requested a quote
Avatar for Christopher Robert Ceinar
Christopher Robert Ceinar
5.0(
14
)
Fixed Generator - InstallPortable Generator - Install

Serving Napa, CA and surrounding areas

Approved

In business since 2023

Offers commercial services

"We had an amazing experience with our electrician! He handled everything from installing our switches and outlets to completing the electrical wiring with incredible attention to detail. He also installed and wired our garage door motor flawlessly, and made sure everything, including the subpanel, was done properly and safely. What really stood out was his professionalism and work ethic. He kept everything clean and organized, which made a huge difference It’s not easy finding someone this reliable, skilled, and thorough. Highly recommend to anyone looking for quality electrical work done right the first time!"
3 neighbors recently requested a quote
Avatar for Villa Handyman - Unlicensed Contractor
Villa Handyman - Unlicensed Contractor
4.6(
47
)
Portable Generator - Repair

Serving Napa, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2010

Free estimates

Customers say: True professional

"Armando is very professional, and I almost did not hire him because of a previous review he had on his feedback. Therefore, I received another quote from a higher rated area contractor who also stated prices were better. The other company failed to show up as scheduled, but arrived the following day and his prices were higher than Armandos quote. He did a fantastic job, price was fair, and was promt. He is trust worthy too, I had to run to my daughters college, 3.5 hours later, I arrived back at home..everything was perfectly installed, other items working in tip-top shape. He is respectful, and he is picks up after himself (and some of my extra dog hair too). Armando is my new, go to handyman. I am sure you will find him great.. He serves the Pleasanton area toom"
New remodel kitchen
Main water line replace
All cities projects well
All cities projects well
All cities projects well

+9

Response time4 hrs
Response rate89%
11 neighbors recently requested a quote
Avatar for Golden Bay Electric
Golden Bay Electric
4.9(
29
)
Portable Generator - Install

Serving Napa, CA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"Edgar is very detailed, respectful, professional with very good customer service! He showed up on time and completed the electric panel change sooner than expected! I have already referred him to my cross the street neighbor, Diane. Hopefully she will reach out soon for an estimate to change out her electrical panel too. Thank you ð ð"
Response time2 days
Recommended by92%of homeowners
Avatar for Bragg Home Services
Bragg Home Services
4.7(
46
)
Fixed Generator - InstallPortable Generator - Install

Serving Napa, CA and surrounding areas

Approved

In business since 1968

Free estimates

Small jobs welcome

"The installers were very sweet and professional. But I donâ t think I was made completely aware of how the exterior installation would look. The last 4 or 5 feet of the white pipeline are not covered and it looks unfinished and messy."
Response time2 days
Response rate100%
174 neighbors recently requested a quote
Warner Electric
5.0(
6
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Napa, CA and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

"Steve and his team have done a number of jobs for me from installing light fixtures to adding additional outlets in the bathroom which required going underneath the house. They are professional, timely, courteous, clean, reliable and reasonably priced!"
7 neighbors recently requested a quote
Recommended by100%of homeowners
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Showing 1-10 of 108
Generator Install questions, answered by experts

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.

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.

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

Sizing a generator is a careful process that requires calculating the electrical load of your entire house. You have to take into account every device you want to use and their wattage requirements, plus the wattage needed to start them, and look for a generator that can safely run all that at around 80% capacity.

In more practical terms, a small home can run on a 10,000-watt generator (and if you only want to power a few key appliances, much less than that). A mid-sized home may need something between 15,000 and 22,000 watts. Larger homes require 25,000 watts or more. 

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 Napa, CA homeowners’ guide to generator installs

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