We’re based in Porth and cover all of South and West Wales for boiler and air-conditioning services, including Cardiff, Newport, Swansea, and the wider Rhondda Cynon Taf area.

Do you offer finance options?

Yes—finance options are available on selected installations. Get a free quote and we’ll confirm available plans and eligibility.

Reliable Heating & Cooling Experts in South Wales

Q: Are your engineers qualified?

Yes. Our engineers are Gas Safe registered and F-Gas certified, with Haier Pro certification and Worcester accreditation, and over 15 years’ industry experience.

Q: How often should I service my system?

We recommend an annual boiler service and regular AC servicing to maintain efficiency, safety, and manufacturer warranties.

Trusted experts in Porth and across South Wales for boiler installation, servicing & air conditioning. Over 15 years’ experience, Gas Safe registered, and 100+ 5-star Google reviews

Heating & Cooling Experts in South Wales

From boiler installations and servicing to modern air conditioning systems, we’ve got you covered.

Who Are We?

At MJB, we make heating and cooling simple, modern, and reliable. From new installations to servicing, our focus is on efficiency, comfort, and long-term value. We combine expert knowledge with a customer-first approach so every job is done right, the first time.

MJB Heating and Cooling Solutions in Porth

With training from British Gas and experience across all major boiler brands, we’re trusted by homeowners and businesses across Rhondda and South Wales. Our mission is simple: reliable service, fair prices, and work done right the first time.

Over 100 Google Reviews

15+ Years Experience

Gas Safe Registered

Haier Pro Certified

F Gas Certified

Worcester Accredited

How It Works – Simple 3 Step Process

Heating and cooling specialists in South & West Wales – trusted for boilers, servicing and air conditioning.

Get a FREE Quote Online

Tell us about your boiler or air conditioning needs and get a quick, no-obligation quote.

Book Your Installation or Service

Choose a date that works for you. Our certified engineers will arrive on time, fully prepared, and ready to get the job done.

Enjoy Year-Round Comfort

Whether it’s a new boiler or energy-efficient air conditioning, relax knowing your home is running safely and efficiently.

Our Services

At MJB Servicing Ltd Heating and Cooling, we specialise in reliable, efficient heating and cooling solutions across Rhondda and South Wales. From new boiler installations to modern air conditioning systems, our Gas Safe and F-Gas certified engineers deliver expert service you can trust.

What Our Clients Are Saying

Every MJB Servicing Ltd customer experience reflects the trust and expertise behind our heating and cooling services. Their feedback isn’t just praise—it drives us to deliver smarter, more efficient solutions and keep homes and businesses in Porth comfortable all year round.

      EXCELLENT  
   Based on 108 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Chris Gordon 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great service and good price.
Came round to plumb in my cooker. Quick and easy.
Cheers
  
 
      Posted on Google  
   
   Lewin Thomas 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent service and communication, very professional and approachable.Came out on really short notice after we were left with no hot water. Will definitely use their service again and highly recommend to others.
  
 
      Posted on Google  
   
   Amit Veja 
 
 
 
 Trustindex verifies that the original source of the review is Google. Would definitely recommend. Very friendly and professional did a great job fitting a new air con system exactly how and where I wanted it. Thanks again
  
 
      Posted on Google  
   
   Vannor Dg 
 
 
 
 Trustindex verifies that the original source of the review is Google. Matthew fitted air con in three rooms. He was punctual, friendly and did an excellent job with the minimum of disruption. Will happily use MJB Servicing again and talk to him if you need air-conditioning work.
  
 
      Posted on Google  
   
   Charles Neale 
 
 
 
 Trustindex verifies that the original source of the review is Google. The recent aircon installation was completed with impressive efficiency and professionalism. Despite a change of location mid-project, the team handled the adjustment seamlessly. There was no disruption, no mess, and no fuss—just a smooth, well-executed service. The crew demonstrated excellent coordination, respect for the workspace, and a clear commitment to delivering quality. A pleasure to work with from start to finish.
  
 
      Posted on Google  
   
   Bob David 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent tradesman, polite, knowledgeable and clean worker, have no problem recommending to friends and family 👍
  
 
      Posted on Google  
   
   Stephen 
 
 
 
 Trustindex verifies that the original source of the review is Google. Matthew from MJB recently did a fantastic job on installing my BOSCH AIR CON UNIT, he was friendly and professional and he went above and beyond to make it look all nice and tidy, there wasn’t any issues with the work he carried out from start to finish, And I can highly recommend him if anybody is thinking about having AIR CON UNIT fitted 👍
  
 
      Posted on Google  
   
   Amanda Law 
 
 
 
 Trustindex verifies that the original source of the review is Google. What an amazing job from start to finish i highly recommend Matthew for any boiler / air conditioning replacement
  
 
      Posted on Google  
   
   Aaron Bessell 
 
 
 
 Trustindex verifies that the original source of the review is Google. MJB Servicing turn up on time, discussed and explained the whole process for our AC install.  They completed the very neat install with minimal fuss and always tidied up at the end of the day, on completion fully explained how everything works and even took away all the boxes a great service all round, would definitely recommend and use MJB Servicing again.

Worcester accredited installers in South Wales

At MJB Servicing Ltd Heating & Cooling, we specialise in keeping homes and businesses in South Wales servicing areas from Cardiff, Newport, Swansea and beyond comfortable, safe, and energy-efficient all year round. With over 15 years of industry experience and training from British Gas, our team has worked on nearly every make and model of boiler and air conditioning system.

Why choose a WAI.

Many WAIs offer extended guarantees on new Worcester Bosch boilers, sometimes up to 12 years, when a system filter is also installed.

Expert Recommendations

WAIs can provide professional advice and suggestions tailored to your needs.

High Quality Installations

These installers are recognized for their high-quality workmanship, ensuring safe and efficient installations of Worcester Bosch products.

Strict Standards

Worcester Accredited Installers must meet rigorous standards at all times.

They are required to register with the correct governing bodies, Gas Safe for gas and OFTEC for oil.

Each installer also completes Worcester Bosch Logic certified training, keeping their skills and knowledge fully up to date.

Manufacturers Oversight

Accreditation is not a one-off badge.

Worcester Bosch regularly reviews the status of its installers, checking registrations and training records.

This ensures every accredited installer continues to meet the highest levels of safety, compliance, and professionalism.

LPG & Caravan Services

New LPG Installations

Safe, compliant setups for caravans and mobile homes.

Annual Gas Safety Checks

Keep your caravan legal and secure with certified inspections.

LPG Servicing & Maintenance

Routine servicing to keep your system running smoothly.

Emergency Call Out Repairs

Fast call-outs when something goes wrong.

FAQ

Everything You Need to Know

Trusted by homeowners and businesses across Porth, The Rhondda Valleys and South Wales. Get in touch today and let’s keep your property comfortable, safe, and efficient.

Where do you cover?

We’re based in Porth, Rhondda Cynon Taf, and cover all of South and West Wales — including Cardiff, Swansea, Newport, Bridgend, Barry, and Llanelli. Whether you need a new boiler installation or air conditioning system, our engineers travel across the region to deliver reliable service.

Are your engineers qualified?

Yes! we’re Gas Safe Registered, Worcester Accredited, Haier Pro Certified, and F-Gas & Refcom Registered for complete peace of mind.

How often should I service my system?

How often should I service my boiler or air conditioning system?

For best performance and safety, we recommend:

Boilers: Once a year — ideally before winter.Air Conditioning Systems: Once a year, typically before summer.
Regular servicing helps maintain efficiency, prevents costly breakdowns, and keeps your manufacturer warranty valid.

What brands do you work with?

We work with all major boiler and air conditioning brands, including Worcester Bosch, Haier, Ideal, Vaillant, and Baxi.
As Worcester Accredited Installers, we can offer extended guarantees — sometimes up to 12 years — when a system filter is fitted.

Do you install air conditioning in homes and businesses?

Yes! We provide both domestic and commercial air conditioning installations. From single-room cooling to multi-zone systems, our team delivers efficient, quiet, and modern climate control solutions across South Wales.

What happens if I have a heating or cooling emergency?

We provide rapid response call-outs for urgent heating or cooling issues. Whether your boiler has stopped working or your air conditioning has failed during a heatwave, our engineers aim to restore comfort quickly and safely.

Why should I choose MJB Servicing Ltd?

With over 15 years of experience, 100+ 5-star Google reviews, and training from British Gas, MJB Servicing Ltd is trusted across South Wales for reliable, professional heating and cooling services.
Our focus is simple — fair prices, expert workmanship, and comfort you can count on all year round.

How can I get a quote?

It’s easy — just fill out our contact form or give us a call on 07979 677209. We’ll provide a no-obligation quote tailored to your home or business needs.