Modern air conditioning is a heat pump. It cools in July and heats efficiently in January, which is why more people in the village are fitting it than five years ago.
Some residential air to air heat pump installations qualify for 0% VAT as an energy saving material under HMRC VAT Notice 708/6, and that relief is due to run to 31 March 2027. It depends on the system, the property and how the work is carried out, so we confirm whether your job qualifies before we quote and show the VAT position clearly on the quotation.
It is the electricity supply. The Codicote Neighbourhood Plan flags strain on the village’s electricity supply as one of the constraints on further development, alongside water capacity and sewers. A multi-split or a ducted system is a meaningful addition to a domestic load.
So before we design anything we look at the consumer unit, the spare ways, the earthing arrangement and what else the property is already running. A house with an electric shower, an induction hob and a car charger on it is a different problem to a house with none of those. Sometimes the answer is that the board needs upgrading first, or that a smaller, better placed single split does everything you need.
The second check is the outdoor unit position, which in Codicote is as much a planning question as a technical one.
Wall mounted split systems. A single indoor unit paired to a single condenser outside, serving one room. This is the workhorse and it is what most people in the village end up with, usually for a bedroom that will not cool down at night or a home office that becomes unusable by two in the afternoon.
Multi-split systems. One outdoor unit serving several indoor units. The sensible route when you want three or four rooms done without three or four condensers on the back of the house. In a village with a Conservation Area and a lot of visible frontages, keeping the number of external units down can be the difference between a scheme that gets waved through and one that does not.
Ducted systems. Indoor units concealed in a loft or ceiling void, feeding grilles in the rooms below. More work, more expensive, far less visible, and what we specify where a property cannot accept visible indoor units.
Every one of these is an air to air heat pump. They cool in summer and in winter they run in reverse, extracting heat from outside air and delivering it into the room at an efficiency no direct electric heater can match. That matters here because the village sits high, above 120 metres in the northern and eastern parts of the parish with peaks nearer 140 metres, and rooms in exposed properties on the ridge can be genuinely cold. It is not a replacement for a gas central heating system, but as heating in a specific room it earns its keep.
The equipment we install is Daikin, Mitsubishi Electric, Samsung, LG or Fujitsu, and the selection is made after the survey rather than before it.
Codicote has a Conservation Area covering the historic centre around St Giles Church and the High Street, with listed buildings inside it including the church, The Goat and the Robin Hood and Little John, both Grade II. The authority you are dealing with is North Hertfordshire District Council.
Two things follow. If the property is listed, external plant and the penetrations needed to install it will normally require listed building consent, and internal alterations can too. If it is in the Conservation Area, a unit on a visible elevation is likely to need permission where the same job elsewhere would not.
It is worth being clear about what the rules actually say now, because a lot of quotes are out of date on this. A reversible split system is an air source heat pump, and on an ordinary house outside the designated areas it is permitted development in many cases. The conditions are about siting it to do the least it can to the appearance of the building and the amenity of the area, keeping it off a wall or roof fronting a highway above the ground storey, keeping it off a pitched roof, staying inside the volume limit, meeting the noise standard, and taking it down when it is no longer used. A cooling only unit is a different question. Rather than guess, we look at the specific property and check the position with North Hertfordshire District Council at survey. That is a short delay. Removing an installed unit because somebody complained is not.
Practically, we site condensers on rear or side elevations, away from the frontage and from neighbouring bedroom windows, on a proper mounting rather than a bracket bolted into soft brickwork. What is unremarkable next to a main road is very noticeable in a quiet lane.
An air conditioning system in cooling mode makes water, and quite a lot of it on a humid day.
Codicote is not the place to be casual about that. Hertfordshire County Council has identified the village as a surface water hotspot, with significant flood risk on the eastern side, and the Neighbourhood Plan records flood risk in Flood Zones 2 and 3 around Codicote Bottom, Fulling Mill Lane and Old Nursery Way. The same plan states the village’s sewers are regularly overwhelmed.
So we do not run a condensate pipe out of a wall and let it discharge onto a path or into an already stretched drain. We plan a gravity run to a suitable termination wherever the layout allows, use a pump where gravity is not available, and put the discharge somewhere that will not freeze, stain a wall or ice a path in winter. On high ground with hard frosts, a badly routed condensate line is the usual reason a system stops working in the middle of a heatwave, because it blocked months earlier.
The new homes coming forward on the allocated sites. Four housing sites are allocated in the North Hertfordshire Local Plan adopted in November 2022, expected to deliver around 350 homes in total, including Site CD3 on land north of The Close, and all four have permission. Modern houses are airtight and well insulated, which is excellent in winter and unpleasant in July, particularly in south facing bedrooms and rooms under the roof. They are also the easiest to install into, because pipe and cable routes can be planned rather than improvised.
Glazed extensions and garden rooms. Every era of housing in the village has had them added, and a large glazed rear extension is a solar collector that no amount of blinds fixes. A single wall mounted split transforms it, and heats it in winter when the existing radiator was never sized for the extra volume.
Loft conversions. The post-war roads such as The Birches, Valley Road and Meadow Way have plenty of properties with the roof space converted into a bedroom or a study. Heat rises, roof rooms have a large surface exposed to the sky, and the original heating design never contemplated the room. This is the most common enquiry we get from the area.
Home offices in outbuildings. Common across the outlying hamlets, Nup End, Drivers End, Potters Heath, Hogsnorton and Rabley Heath, which uses the AL6 postcode rather than SG4. A converted garage or garden building rarely has decent heating and never has cooling. A single split does both, and in a detached outbuilding the planning and noise questions are simpler.
Older village properties. The nineteenth century terraces near New Street and the timber framed buildings around the High Street get uncomfortable in summer and are the hardest to install into sympathetically. Ducted units, or high wall units on rear elevations, careful routing and a conversation with the council.
We do not publish a headline price, because it depends on the number of rooms, the distance between indoor and outdoor units, the pipe route and whether electrical work is needed first.
As a broad guide, a single wall mounted split serving one room is the least expensive and by far the most common. A multi-split serving three or four rooms costs more, though usually less than three or four separate systems. Ducted is the most expensive because of the concealment work.
The 0% VAT where the installation qualifies on residential supply and install runs to 31 March 2027, which is a real saving on the total and one of the reasons enquiries have picked up.
We quote a fixed price after a survey.
Air conditioning needs an annual service to hold its efficiency, and many manufacturers make it a warranty condition, depending on the system and its terms. Filters get cleaned, the coils get checked, the condensate route gets cleared, the refrigerant charge and the electrical connections get inspected. Refrigerant handling is regulated work under F-Gas rules, which is not the sort of thing to take on trust from whoever offered the cheapest number.
A neglected system does not stop dead. It gets less effective and more expensive to run, then fails on the hottest weekend of the year.
Because we started as a heating firm, the cooling survey usually turns into a wider conversation. The room that overheats in July is very often the one at the end of the heating circuit that never warms up in February, and on an exposed property on the ridge that is worth solving properly. Boiler installation, general plumbing, power flushing and drainage are all covered across SG4 and AL6.
Codicote and SG4 8, Rabley Heath in AL6, Nup End, Drivers End, Potters Heath, Hogsnorton, Welwyn, Digswell, Ayot St Peter, Knebworth, Old Knebworth, Kimpton and Whitwell.
Nearby: Air conditioning installation in Knebworth · Air conditioning installation in Welwyn · Air conditioning installation in Datchworth
For the ordinary plumbing jobs, see general plumbing in Codicote.
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On an ordinary house outside the designated areas, often not, because a reversible split system is permitted development in many cases if the siting, size and noise conditions are met. Listed buildings normally need consent, and the Conservation Area over the historic centre around St Giles Church and the High Street makes a visible unit far more likely to need permission. North Hertfordshire District Council is the authority and we check with them at survey.
Yes, on residential supply and installation, as an energy saving material under HMRC VAT Notice 708/6. The relief runs to 31 March 2027.
It will heat the rooms it serves, efficiently, as an air to air heat pump. It is supplementary to central heating rather than a replacement for it, and we will say so rather than overselling it.
That is exactly what we check first. Electricity supply is flagged as a constraint in the village’s own Neighbourhood Plan, so we assess the consumer unit and the existing load before designing the system. Electrical work is carried out by qualified electricians and certificated as part of the job.
Modern condensers are quiet, but background noise levels in the village are low. We site away from neighbouring windows and mount properly, which makes more difference than the specification sheet.
To a planned termination, by gravity where possible and by pump where not. The village is a recognised surface water hotspot with sewers described as regularly overwhelmed, so we do not improvise it.
Call 01462 506374, or use the fixed price quote form, and we will look at the rooms, the electrics and the outdoor unit position.
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