Serving Pontiac, MI and surrounding areas
Approved
In business since 1998
Free estimates
Emergency services offered
"Tech was very professional considering the down pour of rain that happened when he was working on the unit. He answered all my questions and was quick and professional."
+9
Serving Pontiac, MI and surrounding areas
Approved
In business since 1991
Free estimates
Emergency services offered
"The technician, I did not get his name, but it was not Darrel or the Owner, but another guy. He said he took a digital picture and found that my heat exchanger had been damaged by my Older A/C condenser leaking on to it. I later called back to see the picture, but they could not provide it. What really was going on is this technician badly wanted to sell me a new A/C unit. He told me I could get a real good after the season deal for a new 2 ton 13 seer Bryant A/C for $3,500. I had rembered when Darrel quoted me the same price in June, so I knew not to fall for his price. I just had another Company's Technician install today a 2 1/2 to 13 Seer Carrier for $2,750 and he told me he did not see anything wrong with the Heat Exchanger. This was the main reason why I broke down and got the new A/C today. It is evident to me now that the Krane Technician lied to me. I am not happy about this and will not use Krane again, since they hire guys like this."
Serving Pontiac, MI and surrounding areas
Approved (Corporate)
Super Service Award Winner
In business since 1979
Free estimates
Emergency services offered
"A/C service and maintenance . Dan, the technician was extremely pleasant and did a very thorough inspection and cleaning of our A/C components."
Serving Pontiac, MI and surrounding areas
Approved
In business since 2015
Emergency services offered
Warranties offered
"I hired midpoint cool temp to install furnace & air conditioner, the price was negotiable, fast service clean area , I will recommend family and friends"
Serving Pontiac, MI and surrounding areas
Approved
In business since 2016
Free estimates
Emergency services offered
"Zack and his crew did a great job replacing our furnace, even worked on Sunday so we could have heat!! Would highly recommend them to anyone..."
Serving Pontiac, MI and surrounding areas
Approved
In business since 2021
Free estimates
Emergency services offered
"Did a great job. Went right to work and followed up to make sure everything was alright. Very happy with their install. Not to mention was a large home and had central air installed. Very professional"
Serving Pontiac, MI and surrounding areas
Approved
In business since 2025
Free estimates
Offers commercial services
"Safe air was wonderful to work with with they came in on time and made sure they did a great job we will be using them again in the future"
+3
Serving Pontiac, MI and surrounding areas
Approved
Free estimates
Emergency services offered
Small jobs welcome
At Smart Zone Heating & Cooling, we provide reliable, high-quality heating and cooling services for both residential and commercial customers. Our goal is simple: deliver dependable HVAC solutions that improve comfort, efficiency, and long-term performance.\n\nAs a licensed and insured HVAC contractor, we specialize in professional installation, repair, and maintenance of heating and cooling systems. Whether you need a new furnace installation, air conditioning repair, system replacement, or preventative maintenance, we focus on doing the job right the first time.\n\nWe take pride in offering honest recommendations, fair pricing, and high-quality workmanship. Our team understands that HVAC systems are one of the most important components of any home or business, which is why we work efficiently, communicate clearly, and treat every property with care and respect.
Serving Pontiac, MI and surrounding areas
Approved
In business since 2020
Free estimates
Credit card accepted
"The morning our air went out I spoke with Allison and she made sure that they could get out to us right away! Randy and Karla came that day did an amazing job with our AC/Furnace replacement. Great people at a great price. Our systems work amazing now. I recommend them too all my friends and family!"
Serving Pontiac, MI and surrounding areas
Approved
Super Service Award Winner
In business since 2007
Free estimates
Emergency services offered
"The repairman had to deal with original 1955 ungrounded outlet in our garage. When he realized what he needed to complete the repair, he made a trip to Lowe’s for a dependable CFI outlet, returned and cleanly finished with multiple checks to see everything now worked reliably. I’d recommend Valentine Repairs highly."
+263
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.
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