How to cool a new build in Hastings

The very things that make a new build efficient in winter are what trap heat in summer. Airtightness and thick insulation stop warmth escaping in the cold months, and stop it escaping just as effectively once the sun is doing the heating instead of the boiler - so solar gain through large glazing and everyday internal heat have nowhere to go. A single-aspect flat cannot draw a cross-breeze to help matters. The problem is recognised enough that Part O of the Building Regulations now directly limits overheating in new homes. Insulating further would only make the problem worse; what actually helps is mechanical cooling, ideally from a unit that heats efficiently in winter too, given how many of these homes have no gas connection to begin with. For a typical Hastings new build, the median floor area is around 84 sqm - over that footprint of sealed, airtight construction, the trapped heat described above has nowhere to go once the windows are shut.

What those figures mean for your cooling is the real story: the fabric here is efficient, which trims winter bills but is exactly what seals summer heat inside, and these are predominantly modern-build stock, tight enough that once heat gets in it has nowhere to go - which is why the overheating bites harder here than the weather alone suggests. Set against that, Hastings is a dense, flat-heavy urban centre whose built-up core holds onto heat through summer evenings, and air quality (PM2.5) averages about 4.7 µg/m³ and daytime noise around 38 dB - together these decide whether night ventilation is a real option here. This is historic ground, too: a meaningful minority of these homes sit inside a conservation area and some sit close to a listed building - which is why the planning route for an outdoor unit needs more care here than the approval rate alone suggests. Being near a listed building is not the same as your home being listed.

For most Hastings new builds, the strongest option is an air-to-air heat pump - a modern high-wall or ceiling unit, the same hardware people loosely call "air conditioning", except it heats as well as cools. It is near-silent, controllable room by room, and because it does both jobs it can replace your existing heating entirely. There are two honest ways this plays out, and which one applies to you turns on a single decision: whether you replace your heating or keep it. For context, a typical Hastings new build runs around 84 sqm and already costs about £295 a year to heat - the baseline the figures below are measured against.

Branch 1 - replace your direct-electric heating, and the £2,500 grant is in play. The £2,500 air-to-air grant (Boiler Upgrade Scheme) only pays when the heat pump replaces your fossil-fuel or electric heating and is fitted by an MCS-certified installer. So if you take out your existing system and let the air-to-air heat pump handle your heating as well as your cooling, a job costing around £2,800-£3,220 installed can come down to roughly £300-£720 net. Eligibility is per-property and depends on your current heating and the installer's accreditation - our checker confirms it against your address. (Grant rules as of August 2026 and subject to change.)

Branch 2 - keep your boiler and simply add cooling, and the grant does not apply. If you want to keep your existing heating and only add cooling, that is a private-pay job - a cooling-only add-on that keeps your boiler is not eligible for the £2,500 grant, whatever your heating type. The sensible choice here is usually a single-split air conditioning unit (around £1,500-£3,000 installed), carried out by an F-Gas / REFCOM-registered engineer - not MCS, which applies only to the grant-eligible heat-pump route above.

We match you to the right accreditation for whichever path fits your home: MCS for the grant-eligible heat pump, F-Gas / REFCOM for a pure cooling install. For a typical new build in Hastings at around 84 sqm, sized to that footprint, our checker leans toward air-to-air heat pump, but your own floor, aspect and heating decision move the answer - which is the whole point of checking your specific address.

Planning is the step flats most often get wrong. A house can usually fit an outdoor condenser under permitted development, but those rights do not extend to flats the same way, and inside a conservation area - which Hastings has enough of to make it worth confirming - a street-facing unit generally needs consent from Hastings Council. In Hastings, conservation areas such as Hastings Town Centre, White Rock, Hastings and Cornwallis Gardens, Hastings are where this bites hardest. There is a recent change worth knowing. Since May 2025, England's permitted-development rules let a house fit an air-to-air heat pump - which heats as well as cools - without a planning application in many cases, within set size and siting limits. A cooling-only air conditioning unit does not get that route and needs full planning permission whatever the property, so the system you choose shapes your planning path, not just your comfort. For a typical new build here, our checker's read is: planning permission is likely required. External condenser units must meet permitted-development noise limits regardless of planning route. This is an indicative assessment only - always confirm the final position with your Local Planning Authority (LPA) before installing. Listed-building status was not confirmed - if this building is also listed, listed-building consent will additionally be required. With around 25% of Hastings's EPC-certified stock inside a conservation area (Hastings Town Centre, White Rock, Hastings, Cornwallis Gardens, Hastings among them), confirming the exact boundary before you site an outdoor unit is the single most valuable planning step to take here. None of this is a dealbreaker - approvals happen for homes like this all the time - but it is a step to plan for rather than a given, and one worth confirming for your specific address before you commit. This is indicative guidance, not legal advice.