HVAC Terminology Guide for Homeowners in Birmingham AL

Programmable Thermostat

A programmable thermostat is a device that allows you to automatically control your heating and cooling systems based on a schedule that you set. It enables you to set specific temperatures for different times of the day and night, helping to improve energy efficiency and comfort. For example, you can program it to keep your...

PSC

PSC stands for "Permanent Split Capacitor," which is a type of motor commonly used in HVAC systems for fans and pumps. These motors run on AC voltage and operate at a fixed speed, sometimes offering two or three preset speed options. However, they are generally less energy-efficient compared to newer motor technologies, as they lack...

PSI

PSI refers to "Pounds Per Square Inch," which is a unit of pressure measurement. It describes the amount of force applied over one square inch of area. In HVAC systems, PSI is commonly used to measure the pressure of refrigerants in different parts of the system, as well as the pressure in compressed air systems...

PSIA

PSIA stands for pounds per square inch absolute. It is a unit of pressure measurement that includes atmospheric pressure in its calculation. Unlike PSIG (pounds per square inch gauge), which measures pressure relative to atmospheric pressure, PSIA measures the total pressure, including the atmospheric pressure at sea level (14.7 psi at standard atmospheric conditions). For...

PSIG

PSIG stands for "pounds per square inch gauge," which is a measurement of pressure. It represents the pressure of a system relative to atmospheric pressure. In HVAC systems, PSIG is often used to measure the pressure inside refrigerant lines or tanks. If the pressure reading is zero PSIG, it means the pressure inside the system...

Pulse With Modulation

Pulse Width Modulation (PWM): A technology used to control the speed of motors, such as those in HVAC systems, by rapidly switching the power on and off. In HVAC systems, PWM is often associated with ECM (Electronically Commutated Motors). This method allows for precise control of fan speeds, enabling the system to adjust airflow as...

Purge Unit

A purge unit is a device used in chiller systems to remove non-condensable gases, such as air or other impurities, that can accumulate within the refrigeration system. These gases can impair system efficiency by reducing heat transfer and increasing pressure. The purge unit captures and expels these unwanted gases from the system, ensuring the chiller...

PVC

PVC, or polyvinyl chloride, is a durable and versatile plastic commonly used in HVAC systems for various purposes, such as drain lines, vent pipes, and ductwork. It is lightweight, resistant to corrosion, and cost-effective, making it a practical choice for safely transporting air, water, or condensate without degrading over time.

PWM

PWM (Pulse Width Modulation) is a technique used in HVAC systems to control the speed of devices like fans or compressors by adjusting the power supplied to them. Instead of running at full power all the time, the motor receives a series of rapid on/off pulses, with the duration of the "on" time determining the...

R-22 Refrigerant

R-22 Refrigerant: A chemical compound (also known as Freon) that was commonly used as the refrigerant in residential and commercial air conditioning systems for several decades. However, due to its harmful effects on the ozone layer, its production and use have been gradually phased out under the Montreal Protocol and U.S. EPA regulations. Systems using...

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Rex Murphy

Excellent service, on a Sunday, highly recommend :)

Amanda Horsley

I had to leave another review for this company because we continue to be very impressed. Jonathan is an absolute pleasure to work with.

VWC

Amazing service and very helpful as well as willing to inform me of what was going on.

Melanie Zumm

Gayle Wroclawski

We've been doing a complete renovation of our family home of 30 years to sell and retire. We also needed to make sure we had adequate insulation and have the ductwork inspected. I called Paradise Heating and Air, and found that this was a service they could provide. They were very responsive. I had an estimate within a few days and the job completed the following week. They fixed anything that could become a problem and blew in the amount of insulation to meet the current Hoover building code. Jonathan was so friendly, explained everything that was done and the cost was very reasonable. In fact he talked me out of insulating an area that wasn't really needed!!! I couldn't be happier with the service, and feel good that everything is secure and to code. I highly recommend Jonathan and Paradise Heating and Air!!

Ronald L Speck

Great service, price, and quality workmanship! Highly recommend! I will use them again.

Danna Jones

Great service - always on time and very professional.

Chris Holland

Jonathan and the whole Paradise staff are professional, courteous, and fast. I had a system failure, and they were able to get to me quickly and diagnose the problem. Through Jonathan's research he discovered my system had a warrantied part needing replacement and saved me $1600. I would HIGHLY recommend Jonathan and the Paradise crew and will be using again!

mohannad azzam

Great service, assessed the issue in no time. Discussed all available options, extremely professional and friendly . Appreciated the help. Provided the best price .

J. Chapman

Jonathan was great to work with. He came within a couple of hours after I called at around 4pm. and had us operational around 12 the next day (because he didn’t have a motor for my condensor and had to get one the next day). Will definitely use him again.

DIONDRA ROBINSON

If you are having any HVAC issues please do not hesitate to call Paradise Heating and Air. Mr. Jonathan and his team were quick and provided answers to all my questions. I appreciate how quick they came out and fixed my issue being that we have had some extremely hot temperatures lately. I look forward to working with them in the future. I will be recommending them to anyone who has an issue. Thanks again to Paradise Heating and Air.

Steve S

I had paradise come out to get me started with their paradise maintenance package, and had them take a look at my attic because we had concerns with our insulation not being adequate. They didn’t try to over sell work I didn’t need, and were honest with what exactly was needed to get us back on track. Techs Jonathan and Matthew came out for the initial inspection and service and came back to do the attic insulation. They were patient and knowledgeable (I ask a lot of questions) and took their time. They found all the places that my system was leaking (out and in) air, fixed them, and then filled the attic. They kept the house clean and were respectful and had great attitudes the entire time. They have definitely earned my business, and I would recommend them to anyone looking for HVAC work. They are AWESOME!

Monti Pres

Wonderful

Charles Reynolds

Jonathon, as always, provided great service! He is very efficient and honest. Thanks Jonathon, Charles

chip nieder

Always on time, easy to communicate, finest quality of workmanship and character, affordable pricing. Highly recommended.

Cassandra Moore

Always on time and very well please explain everything that they did

Audray Jones

First of all they are very courteous people. Secondly they gave me an appointment asap and was there right on time in which I was able to keep track of the arrival by text messages. They diagnosed the problem and it was resolved in less than 30mins. I am truly grateful for Paradise Heating and Air. Thank you for your service. Side note: they chose the best name for the company. I was in Paradise after the repair lol

Eileen Gibbs

Professional, on time, fair prices, great job!

Michael Semon

Great service, very professional! Highly recommend.

Katherine Marshall

Extremely nice, on time, helpful and explanatory. Very professional. Thank you

Irv Fietz

Jonathon provides excellent service! Shows up on time, no mess, good at explaining the problem and does high quality work.

Christopher Lee

Jonathan was very knowledgeable and friendly. Appreciated his candor and non-salesy guidance. We will be using them again.

Hector Orozco

Robin O.

Jonathan and his staff were very communicative! Would highly recommend.

Melanie Kettle

They scheduled me in a timely manner. The technician (Jonathan)was very professional, explained the system, and answered all my questions.

Linda Thompson

Jonathan and his helper were awesome. Keeping us informed as to what they were doing as they replaced our heating and air units. They were pleasant to have around and did a great job. They not only left the areas clean they hauled off all the old equipment. We would highly recommended them to everyone.

Lauren E Means

Paradise Heating and Air was great to work with—professional, on time, and very thorough. They communicated clearly throughout the entire process and were upfront about pricing and exactly what they discovered was wrong. I’m very pleased with their service and will definitely use them again. Being on time was a huge plus as well!

Mark Hamblen

Did a very thorough job of servicing my system. Will use again.

Christine Wilcox

They were great. Came out on a Thursday and looked at my system. Went over all of my options of repairs or replacements. Explained both the advantages and disadvantages of both options in detail so I could make an informed decision. Came back out the following Monday to do the work. Very friendly and knowledgeable staff.

Nichole Pompey

Johnathan and his son came out quickly and repaired my air conditioner. He explained very clearly what the issue was and temporarily fixed my air while we waited on the warranty part from the manufacturer. Service and hospitality was excellent!

Joshua Woodall

Jonathan provided excellent service and was extremely knowledgeable. He had our heat up and going in no time and also helped us with setting up functions on our thermostat while he was here!

Pam Cain

Great, fast and professional service always!!

Karen

Johnathan was great! We had a moisture problem in our kitchen cabinets that were on an interior wall. He spent a good amount of time figuring out what was going on, gave us a solution and answered all of our questions. A very good experience!

Byron Archibald

Johnathan and Christian did and amazing job and were well versed and knowledgeable about the unit. They fixed it in a timely manner and my house was cool again within an hour

Rory Chrane

Update: May 2026 Paradise came and serviced my business and home this week per the service agreement I asked them to sign me up for. Excellent trustworthy people and processes yields a top level result. You can trust them too. Call them and see what I mean. From the first phone call, I was impressed, I spoke to Jennifer and on a follow up call, I spoke to Gracie. Both are related to the owner Jonathan who came out today and gave me a breakdown and an idea of what is needed and proposed how to go about doing a mini split, which I’m excited to get done, so much so that I wanted to give a review, even before the work begins which I’m sure will be excellent. He recommended a good brand Mitsubishi and explained why he chooses them, giving a very detailed explanation. Jonathan was very personable and efficient and I look forward to the job being completed and future business with this company.

Melanie Authement

Honest and kind. Gave incredible price for work completed. Called and was able to come earlier than expected! Cannot recommend enough

Abby Beckloff

I called at the end of the workday on Friday when we arrived back home from a trip and the temp in our house was 114! We had, fast, fair service and were cooling off within the hour I had called. Excellent experience!

Adam Myers

One of our AC units decided to give up, or so we thought. We had several companies come out and give us a quote to replace our unit, all exceeding $13k. Paradise came out, and instead of just giving a price to replace it, they asked if they could tinker with the equipment. They had it fixed within 10 minutes!!! Paradise gave us a quote so we have an idea of the cost for when this ancient unit ACTUALLY dies, and it was $3k-$8k cheaper than our other quotes!!! They could have easily just given us a price for a new unit like everyone else. I appreciate that Paradise put forth the effort to figure out the problem, and saved us THOUSANDS!!!

Zac Goozee

Jonathan and team are hands down the best folks I have ever worked with in the home services industry. Reasonable prices, high quality work, great communication and responsiveness, 5 stars all around. Highly recommend.

Marianne Herman

Jonathan is highly technical, knowledgable, and efficient. I wish I had known his company years ago. I highly recommend Paradise for all heating and air needs.

Sandy Hicks

Being a first time customer I was extremely impressed with how punctual and professional the technicians are. I highly recommend Paradise Heating and Air

Yan Zhu

Jonathan came by and discussed my problem with me. He was professional and gave me helpful suggestions. He did not even charge me for his time. It was a pleasure to work with them, please give the company a try.

B. Keith Putt

Excellent company! Jonathan and Matt were professional, friendly, and extremely efficient. They had my HVAC system replaced in 4 hours! If my other unit ever bites the dust, they will be the ones I call for a new one!! I highly recommend them.

David Brainerd

Jonathan did a great job. Highly recommended.

Nicole Dent Travels

These guys got the job done! Came in did not try to sell me a unit but fixed my existing unit and I appreciate them so much bc it was the hottest day of the year and my unit was completely out. I recommend 💯

Donna Butler

On time. Responsive. Seemed confident with expertise. Explained issues well. Serviced and repaired older ac system and did not try to sell me a new one. Kept everyone cool for Mothers Day.

Kevin

Thank you Paradise Heating and Air for your quick response, great customer service and fair price!

Ken Little

Awesome Work! Great Experience with Jonathan and Paradise Heating and Cooling Great experience from Jonathan and Christian! Job: Disassemble and remove old attic ductwork and install new ductwork and runs. Install Accuclean air filter in both attic and main floor systems. Install new smart thermostat and attic insulation infill. 1. Honest assessment of what is needed and more importantly, what is not needed. And not just trying to sell the most expensive option. 2. Competitive and reasonable quote. 3. I asked about radiant heat treatment as an add on, but he said while they could do it, it would not have efficient results and not worth the investment since I had a high hip roof and large attic area. 4. Great work ethic and work product. Duct system, filtering system and thermostat expertly installed, set up and running effectively. 5. All interactions cordial, efficient and polite. 6. Punctual in accordance with automated notices about arrival and appointment reminders 7. Clean work - brought coverings to reduce tracking of insulation through house areas traversed. Cleaned any evidence of insulation. 8. Works relatively quietly. No loud talk or music. 9. Small footprint on street. One van. I expected van and trailer. New materials brought in, unloaded and installed while old duct system all loaded up and removed. Very efficient. Overall, fantastic experience and is highly recommended.

Songwei Wu

M Sewall

Paradise was very responsive and was able to come same day. Very professional, nice and honest - would recommend to anyone!

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