FAQs
You've got questions? We've got answers. Find the answers to your questions about MJB Servicing and our heating and cooling services.
Frequently Asked Questions
We've compiled a list of commonly asked questions to give you quick and informative answers.
Air conditioning questions
How much does air conditioning cost to install in the UK?
A typical single-room split system costs approximately £1,500–£3,000 installed. Multi-room systems can cost £4,000–£8,000 or more, depending on the property.
How much does air conditioning cost to run?
A typical efficient unit might consume 0.5–1 kWh of electricity per hour during cooling. At 25p/kWh, that's approximately 13–25p per hour. Actual costs vary with temperature, insulation and usage.
Can air conditioning heat my home in winter?
Yes. Most modern split air conditioning systems are air-to-air heat pumps, meaning they can provide both heating and cooling.
How long does installation take?
A standard single-room installation usually takes around one day. Larger systems may take two or more days.
Do I need planning permission?
Not always. Planning rules vary across England, Wales, Scotland and Northern Ireland, and depend on the property, outdoor unit and location. Check with your local planning authority.
Is air conditioning noisy?
Modern indoor units are generally quiet, particularly in sleep mode. Outdoor units make more noise, so positioning is important.
Does air conditioning need servicing?
Yes. Annual professional servicing is commonly recommended for domestic systems, along with regular filter cleaning.
Do I need to refill the gas every year?
No. Refrigerant circulates in a sealed system. Regular refilling should not be necessary; loss of refrigerant suggests a leak or another problem.
Boiler questions
How quickly can you install a new boiler?
Most boiler installations are completed in 1–2 days.
What boiler brands do you install?
We install all leading brands, and specialise in Worcester Bosch as a Worcester Bosch Accredited Installer.
Can I get an extended guarantee on a new boiler?
Yes. As Worcester Accredited Installers we can offer extended guarantees on new Worcester Bosch boilers, sometimes up to 12 years when a system filter is fitted.
How often should I have my boiler serviced?
At least once every 12 months, ideally before winter. Regular servicing keeps your boiler safe, efficient and covered by its warranty.
Do you service and repair all boiler makes?
Yes, including Worcester Bosch, Vaillant, Ideal, Baxi, Glow-worm and others.
How quickly can you come out to a broken boiler?
We aim for same-day call-outs wherever possible, depending on part availability.
About MJB Servicing
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 an air conditioning system, our engineers travel across the region to deliver reliable service.
Are your engineers qualified?
Yes. We are Gas Safe registered, Worcester Accredited Installers, Haier Pro certified, and F-Gas and Refcom registered for air conditioning.
How often should I service my system?
Boilers should be serviced every year, ideally before winter. Air conditioning should also be serviced yearly, typically before summer. Regular servicing keeps your system efficient, helps prevent 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 on new Worcester Bosch boilers, sometimes up to 12 years when a system filter is fitted.
Do you install air conditioning in homes and businesses?
Yes. We install air conditioning for both homes and businesses, from single-room cooling to multi-zone systems, across South Wales.
What happens if I have a heating or cooling emergency?
We offer rapid-response call-outs for urgent heating and cooling problems, so we can get your home or business comfortable again quickly and safely. Call 07979 677209.
Why should I choose MJB Servicing Ltd?
Over 15 years of experience, more than 100 five-star Google reviews, and training from British Gas. We focus on fair prices, expert workmanship, and keeping you comfortable all year round.
How can I get a quote?
Use our enquiry form or call 07979 677209 for a free, no-obligation quote.

