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Avatar for Air-Tech Air Conditioning & Heating Inc
Air-Tech Air Conditioning & Heating Inc
4.5(
202
)
Central A/C - InstallAir Ducts & Vents - CleanCentral A/C - Install - For Business+4 more

Serving Monrovia, CA and surrounding areas

Approved

In business since 1988

Free estimates

Warranties offered

"I just wanted to communicate my satisfaction with AirTech's customer service. I had the recommended six month maintenance performed on my Mitsubishi mini split cooling and heating unit today. I requested technician Mark Klotz by name for today's service appointment and he did not disappoint. He was once again personable and professional throughout the visit and answered all the questions I had regarding my unit and its performance."
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+8

48 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for Air Duct Professionals
Air Duct Professionals
4.7(
1,517
)
Air Ducts & Vents - Clean

Serving Monrovia, CA and surrounding areas

Approved

In business since 1990

Free estimates

Warranties offered

"great!!! second time using Air Duct Professionals - Casey arrived promptly, called in advance. Explained everything he was doing, was courteous and professional. Will definitely use this place again and again."
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+11

1 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for RS Air Conditioning & Heating
RS Air Conditioning & Heating
4.9(
23
)
Central A/C - Service or Repair

Serving Monrovia, CA and surrounding areas

Approved

In business since 1990

Free estimates

Emergency services offered

"Ray was very responsive and professional since my first contact with him. He came out early the next day to diagnose my broken AC and walked me through the testing stages and explained what he was doing, how it works, and why. He tried several methods to get the system up and running but ultimately, we had to replace the old unit. Since we were in a 100 degree heatwave, Ray was mindful of our situation and came early the next day to install the new unit within an hour. Very fortunate to have a seasoned professional like Ray to help us amidst the heat and Covid. I would highly recommend him to anyone looking for central AC work."
New Outdoor Install
Furnace Install
Satisfied Client
Energy saver!
Carrier Water Soure

+2

Response time3 hrs
Response rate100%
Recommended by100%of homeowners
Avatar for All City Plumbing, Air & Electrical
All City Plumbing, Air & Electrical
4.9(
270
)
Central A/C - InstallCentral A/C - Service or Repair

Serving Monrovia, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2009

Emergency services offered

Warranties offered

"I had a gas valve and water valves that were woefully old and needed replacing. I read the reviews for All City and was impressed so I gave them a call. From the beginning, the experience was fantastic. Jasmine answered my call and was pleasant, informative, and answered all of my questions. She was able to get someone out to my house in a day! The day of service I received a text from my tech, Ruben, letting me know he was on his way, and he was early at that! I can’t say enough great things about Ruben. He is friendly, professional, knowledgeable, and just an all around cool dude! He had my gas valve fixed within 15 minutes, which is no small task. The valve and piping are over 50 years old. I was impressed with how quickly and thoroughly the job was done. He had to come back the next day to replace the water valves so we made an appointment for the next morning. Let me first say, I am an early riser. I jokingly told Ruben this the prior day when asked what time he could arrive the next day, we set the appointment for 9am (I’m already up for 3 hours normally). At 7am I get a text that he is on his way, Ruben followed this up with a phone call making sure it was ok to come that early. OF COURSE! Again, he showed up smiling and ready to go. Despite the challenges of the ancient pipes he had the job done in no time. He was also kind enough to provide new hoses for the washing machine. Additionally, he actually made a run to the hardware store to get a longer gas hose to accommodate where I intended to position my stacked washer/dryer! Let me emphasize again, I cannot say enough great things about Ruben and the service I received. He went above and beyond any expectations and was able to get a job done that I thought near impossible. People like him are rare these days and not only does his personal work ethic shine through, but by proxy he makes All City a cut above and beyond all plumbing companies. I will defiantly be using them, and requesting Ruben, for all of my plumbing needs moving forward."
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+42

14 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Temp Air System, Inc.
Temp Air System, Inc.
4.8(
54
)
Central A/C - InstallCentral A/C - Service or RepairDuctless Mini-split A/C - Install or Replace

Serving Monrovia, CA and surrounding areas

Approved

In business since 2002

Free estimates

Credit card accepted

"We had Temp Air install our AC unit. The best decision we ever made. They were fast, reliable and dependable. Excellent customer service, did a phenomenal job. After a couple of years something was going on with our unit, I called them and immediately they send out a technician Juan, who was phenomenal. He explained what the issue was and resolved it asap! Highly recommend this company!"
Mini Split Installation
Mini Split Installation
Mini Split Installation
Mini Split Installation
Mini Split Installation

+14

Response time10 hrs
Response rate99%
7 neighbors recently requested a quote
Avatar for Penguin Heating and Air Inc
Penguin Heating and Air Inc
5.0(
15
)
Central A/C - InstallCentral A/C - Service or RepairCentral A/C - Install - For Business+1 more

Serving Monrovia, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Emergency services offered

"I highly recommend this company. Penguin heating & Air was very quick to respond to my request, fast text reply, sent them pics, they replied with a quote, which was way lower than anyone else on this site, or even our regular guy that we normally use, we scheduled an appointment for the very next day, which was today, he also finished the job the same day! David did a very good job, very professional. Despite a terrible rainy day, he got the job done. When he was done he walked me through with exactly what he did. He also quoted me for a service on an existing unit and his quote was almost $200 less than what our regular guy charges us... We will absolutely be using this company again."
Diamond Bar
Diamond Bar
Diamond Bar
Furnace Install
AC Condenser

+6

27 neighbors recently requested a quote
Recommended by6%of homeowners
Avatar for Top Energy Solutions, Inc.
Top Energy Solutions, Inc.
4.9(
62
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceCentral A/C - Install - For Business

Serving Monrovia, CA and surrounding areas

Approved

In business since 2019

Free estimates

Warranties offered

"I highly recommend Top Energy Solutions. During the heat wave my air conditioning system blew out hot air. I expected to wait days for a technician to come out. Leor sent one the next morning. The technician quickly located the problem and fixed it within minutes. Their employees are professional, courteous and very knowledgeable."
Roof Replacement  - Owens Corning Shingle Roof
New Windows Installation in Hollywood
5 Ton Furnace Replacement
Attic insulation
New Mini Split - Daikin Emura

+87

Response time1 day
Response rate98%
6 neighbors recently requested a quote
Avatar for Trinity Heating and AC
Trinity Heating and AC
5.0(
40
)
Central A/C - Service or Repair

Serving Monrovia, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Warranties offered

"I called on a Sunday morning. I purchased a new Ecobee smart thermostat and had trouble wiring it. I really was hoping to get it done immediately, but I was a little apprehensive about if that was possible and also if it would be very expensive. Chris’s called me almost immediately after I posted my request. He came out literally within about an hour. He was really knowledgeable, courteous, and efficient. The cost was very fair. I can’t imagine anything going better. I absolutely recommend."
Furnace Before
AC After
Furnace After
AC Before
Before - Furnace

+83

Response time2 hrs
42 neighbors recently requested a quote
Recommended by30%of homeowners
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Air Conditioning questions, answered by experts

To extend your HVAC system’s lifespan, it’s crucial to keep up with maintenance. This includes changing filters and thermostat batteries, keeping the outside unit clean and clear of clutter, and lubricating moving parts. Watch out for leaks, mold buildup, and blockages to ensure your unit stays in good working order. Spotting these issues early can be the difference between a simple, wallet-friendly repair and an expensive replacement.

The cost to add Freon to an AC ranges from $100 to $350. It can increase up to $600 for large AC units requiring much more coolant. The cost also depends on how much refrigerant your unit needs. If only a small amount of Freon leaked out, your cost would be on the lower side. A complete replacement of all the required refrigerant can get expensive.

ACs don't run on water. They're not connected to drain pipes or any part of your plumbing system. However, they need refrigerant to run. Refrigerant is a gas or liquid that has a low boiling point and absorbs the heat in your home. ACs need this in order to be functional and cool your home. If you suspect your AC is low on refrigerant, you need to contact a licensed HVAC professional. Refrigerant is a dangerous chemical that requires specialized training and permits to work with. 

Replacing both an AC and a furnace takes a full day on average, ranging from eight to 12 hours. The process involves removing the old units, installing the new ones, and ensuring all connections are properly made. If both systems are being replaced simultaneously, it can take longer than installing a furnace alone, so plan accordingly.

If you don't clean your AC evaporator coils, dirt and debris will build up, which impairs the system's ability to transfer heat. This forces the unit to work harder, leading to inefficient performance, higher energy bills, and frequent breakdowns. Over time, neglected coils can corrode, which may cause refrigerant leaks, or develop mold, ice buildup, and a clogged condensate drain, resulting in poor air quality and an uncomfortable home.

The Monrovia, CA homeowners’ guide to air conditioning services

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