Top-rated heating and air conditioning pros.

Get matched with top heating and air conditioning pros in Diamond Bar, CA

Enter your zip and get matched with up to 5 pros

Need a pro for your heating and air conditioning service project in Diamond Bar, CA?

Select your specific project to find the pro for you.

TRUSTED BY DIAMOND BAR, CA HOMEOWNERS

  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon330
    Verified heating and air conditioning services reviews

Find Heating and air conditioning pros in Diamond Bar

Avatar for Air-Tech Air Conditioning & Heating Inc
Air-Tech Air Conditioning & Heating Inc
4.5(
202
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 1988

Free estimates

Warranties offered

"In preparation for replacing my HVAC system, I went through a few different estimates. The reason I chose Air-Tech was not because of price, but because I was impressed by the details provided to me. Rod was great. We went into the attic, reviewed all the components inside and out. And we discussed the scope of the work. Once I agreed, he gave me a start date\time. The crew showed up on time and worked hard for two days. Not only was I comfortable with Rod, but the crew was great. My new system is in place and I couldn’t be happier that I chose Air-Tech. If you’re in the market for a new HVAC system, do yourself a favor and call them. You won’t be disappointed."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+8

Response time5 hrs
39 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for Air Duct Professionals
Air Duct Professionals
4.7(
1,517
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 1990

Free estimates

Warranties offered

"Great. My daughter contracted Air Duct Professionals to do her home. James, the technician, was professional, knowledgeable and did a quality job. I contacted Air Duct to do my home and requested James. James arrived on time and did an excellent job. He also helped me with a leak with my HVAC Condenser and diagnosed and fixed the issue."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+11

Response time1 day
Recommended by93%of homeowners
Avatar for HD MECHANICAL INC
HD MECHANICAL INC
5.0(
30
)

Serving Diamond Bar, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"THE OWNER; CHRIS ROBINSON WAS AMAZING, EXCEPTIONAL CUSTOMER SERVICE, GREAT PEOPLE SKILLS. UNBEATABLE PRICING ON UNITS & LABOR I HAD BEEN QUOTED VERY HIGH BY 4 OTHER COMPANIES, HD MECHANICALs PRICING WAS HONESTLY EXTREMELY AFFORDABLE. HIGHLY RECOMMENDED FOR ALL YOUR HVAC NEEDS!!"
Heating & A/C Project
Heating & A/C Project
Heating & A/C Project
Heating & A/C Project
Additional Photos

+14

Response time6 hrs
Response rate100%
64 neighbors recently requested a quote
Avatar for McLay Services
McLay Services
4.8(
275
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 1978

Free estimates

Emergency services offered

"Archie, Allen, and Chad were all great.  On the first visit, Allen came to replace our 1-piece Costco toilet that would not stop running.  Archie was also here (on the dot at 10 a.m.) for our appt to provide estimate for upgrading our HVAC and water heater.  Archie was very patient and gave us a lot of details on how the job would go, including where they would put the new furnace in our attic crawl space.  He was here for over an hour explaining everything and even gave us a referral to a landscaping contractor at our request.  He even helped Allen load the old toilet onto our car for return back to Costco because I'm too small to lift it and my husband can't lift by himself.  They didn't have to help us load the toilet, but went out of their way to do it.  Above & beyond service. Chad was equally friendly and professional on the second visit (he had to come back as we encountered some leakage with shut off valve and at the pipe connection).  He was in and out in 30 mins and even explained all the different toilet parts to me so I would know what to make of all the toilet sounds next time around (running, squeaking, etc.).  No plumber has ever taken the time to explain an installed part to us before, and it'll help us determine which part is broken (if it does!) the next time.  These guys are truly professionals.  We're keeping their contacts close so we can call them for all our future plumbing issues.
"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+5

8 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for All City Plumbing, Air & Electrical
All City Plumbing, Air & Electrical
4.9(
270
)

Serving Diamond Bar, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2009

Emergency services offered

Warranties offered

The industry's best technicians make the happiest customers. Turn to the pros at All City Plumbing, Air, & Electrical for all of your plumbing, HVAC, and electrical needs. Proudly serving San Bernardino, Riverside, Los Angeles, and Orange Counties. We have over 5000s 5 star reviews across the web from our thrilled customers. Our company goal is to make sure that we have 100% customer satisfaction. We have options and payment plans that can fit in everyones budget. We provide free estimates and you only pay when you're happy. It's no surprise we've received the Angie's List Super Service Award six years in a row! Established in 2009. ACP was created to deliver exceptional service with the highest quality of craftsmanship. We guarantee you will be happy with our services in that we offer a money back guarantee. Our technicians are regarded by their peers to be some of the best in the industry. Our service experts are continuously trained. There isn't a plumbing or hvac problem we can't solve. We have the experience, knowledge and focus to solve any problem you may have. Give us a call today and let us earn your confidence.

Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+42

13 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Trabuco Air
Trabuco Air
4.6(
130
)

Serving Diamond Bar, CA and surrounding areas

Approved

In business since 1996

Free estimates

Emergency services offered

"Sam, who came out to give me an estimate for a new system, found out that the old fan motor was the culprit and recommended that we just repair the motor. He explained things in detail, helped us to save money in a genuinely sincere attitude, I was impressed how good his service was, and I recommend him for any HVAC issues. I will be using him in the future."
Response time5 hrs
Recommended by94%of homeowners
Avatar for SO CAL BOYS HEATING & AIR INC
SO CAL BOYS HEATING & AIR INC
5.0(
54
)

Serving Diamond Bar, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"George is a true professional. He very patiently explained several options for replacing my hvac system. In the end I hired another pro for my project, only because they have been maintaining my system for many years. I would definitely consider George and SO CAL BOYS HEATING and AIR in the future."
2 ton condenser
2 ton furnace
Response time2 hrs
Response rate98%
26 neighbors recently requested a quote
Avatar for Penguin Heating and Air Inc
Penguin Heating and Air Inc
5.0(
15
)

Serving Diamond Bar, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Emergency services offered

Penguin Heating and Air Inc is here to help! We offer a variety of HVAC services from service to installations. We are based out of the Placentia, CA area. Give our team a call today. We're looking forward to working with you!\n

Diamond Bar
Diamond Bar
Diamond Bar
Furnace Install
AC Condenser

+6

Response time2 hrs
Response rate100%
26 neighbors recently requested a quote
Avatar for Temp Air System, Inc.
Temp Air System, Inc.
4.8(
59
)

Serving Diamond Bar, 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
...
Showing 1-10 of 758
Heating and Air Conditioning questions, answered by experts

The cost to replace an AC evaporator coil is typically between $600 and $2,500, with an average cost around $1,300 to $1,350. The price of the coil itself can range from $550 to $1,100, depending on the brand, size, and style, with professional labor adding around $700. Replacing a condenser coil is generally less expensive, costing about $800. Because this repair involves handling refrigerants, it requires a licensed AC professional. Regular inspections, which cost between $200 and $600, can help prevent costly coil replacements.

If left untreated, a frozen AC unit can lead to costly damage, especially to the compressor and evaporator coils. When ice forms on the evaporator coils, they become brittle and more susceptible to breaking. Plus, a freeze makes your AC system much less efficient, which means it's wasting energy and costing you more in your monthly energy bills.

Not if you have a standard unit. Because portable AC units actually work to dehumidify the room, you’ll likely need to drain the unit from time to time—but you won’t have to put water into it. There is, however, another type of air conditioner called a swamp cooler that requires water to operate. If you have a swamp cooler, you may need to fill a reservoir with water and potentially ice. But a swamp cooler is different from a standard portable AC unit.

If your AC unit isn’t cooling and you haven’t figured out why, there are a few good reasons to turn it off ASAP. The source of the issue, whether that be leaking refrigerant or a broken compressor, will worsen and cause more damage to the overall unit the longer the machine is allowed to run. When in doubt, shut it down until you or an AC pro can ensure everything is working properly.

This is a bit of a trick question. Even though the seasons arrive at the same time every year, the weather doesn’t always behave according to the calendar. So, while it’s fair to say that you can expect to turn on your AC starting in late May or early June, it all depends on the outside temperature and how cool you like to keep your home.

The Diamond Bar, CA homeowners’ guide to heating and air conditioning services

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