Serving Danville, CA and surrounding areas
Approved
In business since 2005
Free estimates
Emergency services offered
"We like them, they are very good. They are going to do our air conditioning."
Serving Danville, CA and surrounding areas
Approved
In business since 2021
Free estimates
Emergency services offered
"I called Smart Heating and Air Conditioning for a quote to replace my AC unit. Mike, came out and took his time with the inspection, and also took his time explaining to me everything that needed to be done. The pricing is competitive, but definitely worth the money. The whole install went perfect."
Serving Danville, CA and surrounding areas
Approved
In business since 2009
Free estimates
Emergency services offered
"We chose repair of a very old air conditioning unit due to the cost of a new unit. It is working now but we have no guarantee of for how long. Global responded quickly and repaired the unit within hours."
+9
Serving Danville, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2020
Free estimates
Warranties offered
"I highly recommend this company to do your heating and air conditioning project. John Alanis and his crew did an excellent job and the pricing he gave us beat the competition. Thank you John and I’ll make sure to spread the word to my friends and relatives."
+4
Serving Danville, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2016
Free estimates
Emergency services offered
"I m thrilled with David Mendoza, Shane, and the entire crew. The crew was professional, knowledgeable and fun to work with. For the first time in 25 years the entire house has a uniform temperature! They cleaned the house when finished! I have no reservations in recommending Perfect Star Heating and Air Conditioning and David Mendoza s team. Outstanding work."
+8
Serving Danville, CA and surrounding areas
Approved
Super Service Award Winner
In business since 1991
Free estimates
Emergency services offered
"Great team. While the job is messy as they have to work under your house. Aire Serv was great to work with. We needed new ducts and boots and my house is now moving air better than it has in twenty years. Highly recommend Aire Serv."
+58
Serving Danville, CA and surrounding areas
Approved
In business since 2016
Free estimates
Emergency services offered
"Elite heating and air was very knowledgeable when it came to high efficiency heat pump mini split systems they put a multi zone in our 750 sq ft adu with a 12 year unit replacement warranty thank you once again"
+14
Serving Danville, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2008
Free estimates
Emergency services offered
"Exceptional company, exceptional work done for us. We had an emergency need with a failing furnace. 411 was able to come out on Sunday, the same day. Our HVAC system was 35 years old and I knew it needed to be replaced, and they were able to do so within two days. In addition, they were able to identify why our upstairs remained hot in the summer despite air conditioning. They were able to install a withdrawal vent that will greatly increase the removal of hot air in the summer, and therefore the effectiveness of our air conditioning. All this was done at a very competitive price. I feel very lucky that they answered our call that day. I can?t recommend the more highly."
+3
Serving Danville, CA and surrounding areas
Approved
In business since 2020
Free estimates
Emergency services offered
"I worked with Techno Air and found them to be one of the most professional companies in their field. Their team pays great attention to even the smallest details and delivers high-quality service. In addition, their after-sales service is excellent, reflecting their commitment to customer satisfaction and ongoing support even after the work is completed"
+82
Serving Danville, CA and surrounding areas
Approved (Corporate)
In business since 1981
Free estimates
Warranties offered
"The repair person showed up on time, quickly diagnosed the problem, had a replacement part on hand, quickly repaired the wall furnace, cleaned up the dust/debris, and did a CO2 check."
+73
Most professional HVAC technicians require two to three hours to complete an expansion valve replacement. The timeframe depends on your unit's accessibility and whether additional repairs are needed. The process involves recovering refrigerant, removing the old valve, installing the new component, and recharging the system. Scheduling during less busy seasons may result in more convenient appointment times.
Operating your air conditioner with a malfunctioning expansion valve isn't advisable. Continuing to run the system could potentially damage other components, particularly your compressor, which is significantly more expensive to replace. If you notice performance issues like inconsistent cooling or unusual noises, it's best to have your system inspected before continuing regular use.
Expansion valves don't have a standard replacement schedule, as their longevity depends on system usage, maintenance frequency, and environmental factors. Regular professional maintenance helps identify potential valve issues before they cause system failure. Having your HVAC system serviced annually allows technicians to monitor component condition and recommend preventative replacements when necessary.
Refrigerant leaks require prompt professional attention. If your expansion valve is leaking, you'll likely notice reduced cooling performance and possibly hear hissing sounds near the unit. Addressing leaks quickly prevents further system inefficiency and avoids the environmental impact of released refrigerant. Your HVAC technician will need to repair the leak and recharge the system with the proper refrigerant type and amount.
Because many AC issues present similar symptoms, professional diagnosis is recommended. Problems like inadequate cooling, inconsistent temperatures, or strange noises could indicate expansion valve issues, but might also stem from refrigerant leaks, electrical problems, or airflow restrictions. A qualified HVAC technician has the tools and expertise to accurately identify the root cause and recommend appropriate repairs.
From average costs to expert advice, get all the answers you need to get your job done.
Need fascia and soffit repairs? Hiring a pro ensures proper installation, protects against pests, and prevents structural damage. Learn about common warning signs, material options, and how fascia and soffits safeguard your home from moisture.
Use this guide to budget for oak flooring installation based on factors such as room size, type of flooring, stain and sealant, and labor.
Budget for the cost to install a propane furnace based on factors such as furnace size, furnace type, efficiency level, labor rates, and more.
Discover how much it costs to hire a housekeeper based on factors like house size, required services, and cleaning frequency.
HomeAdvisor's Lighting Repair Cost Guide lists price information on fixing a light or light fixture, as reported by HomeAdvisor customers.
Use this guide to budget for wall oven installation costs based on factors such as oven type, power source, mounting type, labor, and more.