HVAC and Solar Services Serving All of Solano, Napa & Contra Costa Counties, and the Bay Area

Our Reputation speaks for Itself

A-1 Guaranteed is a family-owned and operated business that serves HVAC and Solar Services Serving All Of Solano, Napa and Contra Costa Counties, Fairfield, Vacaville, and the Bay Area with Heating and Air Conditioning, Solar, Tankless Water Heaters, Windows, Insulation and/ or Duct Replacement needs. As one of the premier service businesses in the area, we have helped thousands of satisfied, loyal customers improve the energy efficiency of their homes and offices.

We are available Monday through Friday and by appointment on Saturday. Our fast and efficient attention to your needs will prove our dedication to our customers is the foundation of our business. Our professional staff is knowledgeable and looks after your best interests when it comes to your environmental comfort needs. We are an Energy Upgrade CA participating contractor. We are honored that our customers consider us #1 in providing trustworthy service and dependable comfort.

Why Choose

A-1 Guaranteed?

  • Voted best heating/cooling company for 14 years
  • Voted Best of The Bay for 5 years of KRON 4 TV
  • Commercial and Residential Installation
  • Angie’s List Super Service Award for 2 Years
  • Energy Upgrade Participating Contractor
  • Factory Trained Installers and Techs
  • Drug-free Environment Enforced and Maintained
  • Better Business Bureau Honor Roll 20 Years
  • Diamond Certified Company
  • North American Technician Excellence (NATE) certified
  • Bay Area Certified Green Business
  • All employees fully background checked for your safety
Recent News


How to Reset Your AC After a Power Outage

Steps for Resetting Your AC

After a power outage, your AC may need to be restarted in order for it to go back to working at its maximum efficiency – or working at all. If the air conditioner doesn’t start functioning on its own when the power to your home is restored, it doesn’t necessarily mean the unit is broken; it may just need to be reset. Here are 4 steps you should do if your AC needs to be reset after a power outage.

1. Set the Thermostat to “Off”

The first thing you should do is turn your thermostat to “off”. This stops the thermostat from asking your AC unit to send cool air. For thermostats that are battery-operated, the issue may be that the thermostat needs new batteries and that is why the AC is not working. If your thermostat is not battery operated, the next step will lead you to your breakers.

2. Reset Your Breakers

If your power went out in the event of a thunderstorm, a power surge may have overloaded the circuit that your air conditioning unit is on. Resetting a breaker that has been “tripped” is not difficult, nor is it dangerous. Find the breaker box, which is often located outside your home, in the laundry room, basement, or garage, and search for the circuit labeled “air conditioning/HVAC”. If you see the switch that is in the neutral position, this means that it is neither on nor off. Flip the switch to the right, turning the circuit off, and then back to the left, turning it back on.

3. Wait About a Half an Hour

After resetting the breaker, your air conditioning unit needs some time in order to reset the internal circuit breaker. Waiting a half an hour will give your unit the necessary time it needs to fully reset. During this time, make sure the thermostat is still turned off. If the thermostat is calling for cool air, this is not allowing the air conditioner time to reset properly.

4. Set the Thermostat to “Cool”

When you have waited the thirty minutes to give your AC time to reset, turn the thermostat to its “cool” setting and set the temperature about 5 degrees less than room temperature. Your AC unit should kick on when the thermostat requests cool air from the AC.

If you tried using the steps above to reset your air conditioning unit and found no success, contact a professional at A-1 Guaranteed so we can come look at the unit as soon as possible. There may be an issue that is best left to professionals, so to preserve not only your safety, but also the functionality of your air conditioning unit, contact our local HVAC service technicians.

For any questions or for more information to reset your air conditioner after a power outage, contact us today.

Energy-Saving Measures to Take Before Installing Solar Panels

What to Do Before Installing Solar Panels

More and more people are installing solar panels to the roof of their home in order to use cleaner energy in order to save money and energy. However, before making the transition to using solar energy to power your home, there are certain things that demand your attention. Solar panel installation can be a significant initial investment, so you’re going to want to make sure that your time, effort, and money is well-spent to create a home that operates with maximum efficiency. If you install solar panels but have poor insulation, high-energy appliances, and air leaks everywhere, your solar panels won’t help you achieve your goals. From fixing leaks to installing different lighting, there are a few tasks to make sure are completed before you go solar.

Sealing Ducts

Not many people realize how imbalanced the air temperature can be when ducts are not properly sealed. With solar power, being energy efficient is incredibly important because you want to use only the amount of energy you need. If you seal air ducts where needed, air will travel to the areas of the home that need it most and limit wasted airflow; sealing ducts will help balance the air temperature in your home.

Fixing Leaks

It is important to check your outlets, cabinets, closets, and anywhere else you can think of for potential air leaks. Fixing them before installing solar panels will help you in the long run regarding the use of energy, just like sealing your air ducts. Air leaks is one of the main escape routes for the air that your HVAC system is providing, which in turn will cause it to work harder and use more energy to replace that lost air. Making sure that there are no leaks will ensure that your energy consumption is efficient.

Energy Efficient Lighting

The whole purpose of using solar panels is to use a clean alternative source of energy to power your home’s appliances and lights. This in turn lessens the amount of pollution emitted from using too much energy. However, in order for you to get the most out of using solar power, you need the right kind of lighting that will take your energy-efficient home further. There are certain types of lights that use up more energy than necessary, but there are also lights that are impressively energy efficient. LED lights are among the best and most efficient when it comes to bulbs, so they are fantastic to use when paired with solar panels. They cost more than standard bulbs initially, but they use an incredibly small amount of electricity to run and literally last for many years before they need to be changed. Installing these lights before implementing the solar panels will allow you to be better prepared for the transition and you will be using the perfect amount of energy to light your home.


It’s ideal to have appliances that consume the lowest amount of energy possible when your goal is to make your home energy-efficient. Appliances are some of the biggest energy hogs in the home, and they consume plenty of it even when they aren’t running! However, smart appliances are slowly becoming more mainstream because owners are able to select how much energy to consume for various task levels – if you have only a small load of laundry to wash, for example, you can control the amount of water used. A small load will require much less water for washing than a large load would, which means you won’t be wasting any!

Appliances in the home also includes home systems, including HVAC. Maintaining a regular check-up schedule with A-1 Guaranteed professionals will ensure that your system is running as efficiently as possible through the years. If you have any questions, contact your local air conditioning and heating service for more information.

Before installing solar panels, make sure that your home is ready for the new type of energy that is going to be supplied to your home. Make sure lights are not going to use too much energy, air leaks are not going to make your HVAC system work harder, and your appliances will use only the necessary amount of energy.

If you have any questions about your HVAC system and how you may be able to use it more efficiently, contact us today.

What “Carbon Footprint” Means and How We Can Make It Smaller

Energy Efficient Changes to Your Home

One of the most pressing issues we face today is climate change. Many factors contribute to this problem, and one that stands out quite a bit is our carbon footprint. It is important to know exactly what a carbon footprint is and how we can make changes to reduce the footprint.

What is Our Carbon Footprint?

The term “carbon footprint” describes the amount of carbon compounds and carbon dioxide that is released as a result of the world using fossil fuels. For many years, our main source of energy has been fossil fuels, commonly natural gas, petroleum, and coal. Due to the fact that these fuels have been used in abundance for so long, there has been a sharp increase in the amount of carbon dioxide being emitted over time, hence our “carbon footprint”. While this is an issue for not only our planet but also for us, there are certain things you can do to minimize the amount of carbon compounds released by making subtle changes around your home, resulting in a reduction of the energy you use.


Some of the things in your home that consume the most energy are appliances, primarily your washer and dryer, furnace, air conditioning unit, and your refrigerator. Luckily, there are energy-efficient appliances that are slowly becoming more and more mainstream because they do just as good a job as regular appliances, only they save you money and energy. Most of the time, an appliance will use more energy than needed to function, and they even use energy when they aren’t actively running; doing so will rack up your energy bill in addition to emitting more carbon compounds into the air. Energy-efficient appliances work to limit this non-essential energy use.

Energy efficient appliances make it a priority to use only the amount of energy needed. To find out more about energy-efficient heating and air conditioning units, contact your local heating & cooling repair and maintenance business to find the right appliances for your home and for your daily needs.

Solar Energy

One of the best types of clean energy is solar energy. Although slightly more expensive at first than other implementations to your home, solar energy will reduce the amount of fossil fuels used and will provide you will clean energy. In the end, you will be saving energy and money while using solar panels.

The Thermostat

Most people make it a point to turn off their heater or air conditioning unit when they are heading out for the weekend or going on a vacation. However, it is not uncommon to forget to turn it off and if that is the case, your HVAC system is working to keep your house comfortable for people who are not home. This uses an incredible amount of energy that isn’t needed. To ensure this does not happen, you can install a programmable thermostat that you are able to adjust with a cell phone app. Forgetting to turn off the air conditioning will no longer be an issue, and you will save money and energy by limiting this non-essential usage. These devices will also adjust the thermostat on a daily basis for you to account for times when your family is at work or school.

Sealing and Insulating Your Home

One of the main reasons HVAC systems use more energy than needed is because more often than not, the home is not properly sealed or insulated; when this happens, the air in your home that your HVAC system has worked so hard to create is literally going right out the window. To stop this, using weather stripping, caulk, and insulation can help reduce air leaks and will cut down on the energy used.

When we first started to realize there was a growing issue with the amount of carbon dioxide going into the air, there were not many alternative options. However, with advancements in science and technology, there are numerous ways you can minimize your carbon footprint by changing your home to be more energy efficient.

If you have any questions about how your HVAC system can be more energy efficient, contact us today for more information.

The 4 Components of Ductwork: Are They Costing or Saving You Money?

Think Duct Tape Solves Everything? Think Again.

Arguably one of the most important parts of an HVAC system are the ducts, and yet the majority of homeowners disregard them for years. We need to take a look at the four different components of air ducts that affect the overall health of your HVAC system as well as your home: cleanliness, thermal efficiency, static pressure, and leakage.


A common misconception about ducts is if you can’t see it, it isn’t there – and we’re talking about dirt, dust, debris, and residue inside ducts. Sealing a dirty duct will not make the problem disappear; sealing it only prevents air leaks; it does not remove debris and dirt that could be harmful to people’s health. Another popular (but false) belief is that cleaning out old ducts is beneficial, but in reality, this is not necessary. Attempting to clean the duct will agitate the dirt, causing it to get into the air, which may lead to health problems. If you’re looking for services for your HVAC in Walnut Creek, keep in mind that new ducts are hypoallergenic and if they are properly installed, they will remain perfectly clean for the entire life of the system.

Thermal Efficiency

One of the most crucial factors that goes into ductwork is insulation thickness, or R-value. If you have a new duct system, it probably has high efficiency of R8, which is four times higher than the old ducts, which measure at R2 resistances. The newer ducts can be 100% more efficient than most old ducts! The thicker the insulation rating, the less hot or cool air you’ll lose as you run your system, saving energy and money.

Static Pressure

Static pressure is the measured amount of pressure that is inside your duct system. If the ducts are improperly installed or they are too small, excessive pressure will build up. This amount of pressure relates to the loss or gain of energy, which directly affects the lifespan of the system. The majority of systems tested have levels of static pressure that are double what they should be. If the pressure is higher than recommended, the fan inside of the system cannot get the desired airflow it needs, which will result in more energy trying to make up for the lost amount of airflow. This will decrease the life of your system drastically and increase your energy bills.


Air leaks are a major concern with duct systems, and it would seem to make sense to just seal those leaks to fix the problem. However, ducts that have been sealed still have a leakage rate of 15%, versus a leakage rate of just 6% for new ducts. That’s 55% more leakage! A-1 Guaranteed Heating & Air Conditioning, Inc, however; routinely seals ducts to obtain a leakage rate that is as low as 3% on new and replacement duct systems.

It is important to know when it is time for your ducts to be replaced. If it’s been a long time since new ones were installed in your home, contact us so we can determine the best course of action to get your duct system in top shape. Keeping ductwork in good order reduces energy consumption, reduces your energy bills, keeps the air in your home clean and healthy, and more. If you haven’t had your system checked by professionals in the past, you might have leakage, static pressure that is too high or too low, debris in the system or other issues you may not even realize are there.

Contact the experts of all things HVAC in Walnut Creek and the surrounding areas; get a hold of us today with any questions you might have regarding your ducts. We can help!!

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