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Heating, ventilation and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers).
HVAC is an important part of residential structures such as single family homes, apartment buildings, hotels and senior living facilities, medium to large industrial and office buildings such as skyscrapers and hospitals, onboard vessels, and in marine environments, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.
Ventilating or ventilation (the V in HVAC) is the process of exchanging or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air.
Ventilation includes both the exchange of air to the outside as well as circulation of air within the building. It is one of the most important factors for maintaining acceptable indoor air quality in buildings. Methods for ventilating a building may be divided into mechanical/forced and natural types.

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  1. M

    Megaflo only heating with immersion?

    Hey everyone, We bought this house and don't know much about plumbing, and we haven't received any information from the previous owners as to how the central heating was set up. It's a 4000 sqft house, which is heated with a combination of underfloor heating in the ground floor, and radiators on...
  2. R

    New rads not heating- Boiler pump position?

    Hi I've just had a bit of work done in the house where we knocked down the wall between the kitchen and dining room. This wall had radiators either side. Two new radiators have been installed in the new open plan area. When the plumber came to fit the rads and balance the system he was unable to...
  3. I

    Adding new radiator to heating system

    Hello I would like to add a radiator to my current heating system and would like to take some advice on how to achieve this? Thanks
  4. P

    Plumber / Heating Fitter required Kent/East Sussex

    We are looking for a qualified and experienced Plumber or Heating fitter to join our team working on high quality refurbishment projects in Kent and East Sussex. Employed or subcontract positions available, Good daily rates (hours 8.00 - 4.30 Monday to Friday). Thanks
  5. A

    Returning to plumbing and heating - looking for a refresher...

    Hi all, My name is Aaron, I completed a four-year apprenticeship after leaving school and attained my NVQ level 2 in plumbing and also completed, which was at the time, CORGI registration. After my training, I installed a number of boilers, full central heating systems and conversions. I was...
  6. A

    Looking for a heating engineer

    I need to upgrade my heating system from blow air to radiators, house is running off the district heating therefore engineer needs knowledge of district heating. Thanks
  7. M

    Location of secondary return pump and return pipe for underfloor heating.

    I am fitting a secondary return on a system, tank will be in the loft. All the pipework goes up to the loft at the back of a cupboard, I would like the pump to go on the return pipe in here so it is easily accessable for maintenance. My collegue says he thinks it should go to as near to the tank...
  8. S

    Heating issues with megaflo system

    hi, I had my house renovated about 2 years ago. When the new boiler and megaflo system was installed we couldn’t test the heating as it was a particularly hot summer so I agreed with the builders that they could come back and test it in the winter. When I started using the central heating. Well...
  9. P

    draining central heating system

    not sure ill get a straight answer but here goes - single pipe central heating system linked to oil boiler oil boiler is no more - using immersion heater for hot water as interim untill new boiler installed need to remove old central heating system / drain down / remove pipes and rads as...
  10. P

    Heating system ? Vented? Unvented?

    Hi, I had my heating upgraded a few years back by my housing association. I had electric heaters before now I have hot water radiators. I still have a tank in the loft and a hot water tank in the cupboard. Cold water comes from the tank in the loft. Hot water also has low pressure too...
  11. D

    Two out of three radiators not heating up

    Hello — if anyone's got any ideas on this one, I'd be hugely grateful! Here are the details... I live in a small one-bed flat (on one level). Last year I had the water tanks and immersion boiler removed and replaced with a Vaillant EcoFIT combi boiler. The fitters rerouted the pipework as...
  12. P

    which fitting? radiator 15mm pipe to central heating valve

    HI! i am a new member and only a DIY'er i have had to replace a radiator with a smaller one i need to extend the outlet of the radiator by 6" using 15mm copper pipe...what fitting do i use to connect the pipe to the system valve (which has the original radiator fitting connected ) regards
  13. J

    Pushfit heating pipes

    Hi Is this a pushfit elbow? Can the pipe be easily removed should I want to do. Is a release tool needed? Does anyone recognise the fitting? So, that I know what to by. The drain valves are now leaking after draining the system and I've been told the need replacing These look very similar...
  14. Y

    Central Heating pipes for Cold feed

    Hi, I wonder if anyone could advise on the following please. I am in the process of extending a house and one of the tasks has been to strip out the existing radiator pipe (15mm copper) work at the back end of the house to allow for an extension - the radiator circuit will be extended once the...
  15. D

    Unusual Copper Pipe Corrosion

    Hi, I had some of the floorboards up today and I spotted a short section of copper pipe for the heating that is extremely corroded. The copper is flaking away in layers and looks like it should have burst long ago. Not the usual green residue. Does anyone know what may have caused the...
  16. Rob Foster

    1.6M Heating Systems Fitted Last Year

    A repost hopefully this works this time 6.2m radiators sold...just blow the attachment up It shows just how small the renewable market really is centralheatking
  17. M

    central heating upgrade and two bathrooms

    manchester based. anyone interested in quoting?
  18. M

    is this quote fair? central heating upgrade

    hello i'd like to know if the following quote is broadly fair. house is four bed, three reception rooms and two bathroom, kitchen plus utility. Flush system as per manufacturer’s instructions. • Protect your home with carpet protector and dust sheets as required. The works for your system...
  19. O

    No power to heating pump.

    Hi guys needed some advice had to change a TRV on a radiator so drained down the system 12 rads altogether there is a unvented cylinder and heat only boiler i refilled the system again bled the air from all the radiators and air release valves by the cylinder all fine but there seem to be no...
  20. S

    Plastic Central Heating Filters TF1 is metal better?

    I have a Fernox TF1 made of plastic. It always seems to leak a bit after being serviced and needs the joints tightened up. Occasionally it has leaked quite a lot (enough for a puddle after being unnoticed for a while). I don't like the top cap which has threads that are stiff and awkward (even...

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