HEAT PUMPS
3-in-1 heating, ventilation and cooling system retrofi t in older home
The UNICO 3-in-1 heating, ventilation and cooling system is a solution to retrofi t older homes that may be draughty, energy ineffi cient, have poor insulation and generally hold uneven temperatures that encourage problems like mould and suff er from little ventilation and airfl ow.
Cooling and ventilating in the summer allows windows to be kept closed, ensuring pollen
and other pollutants cannot diminish the indoor air quality. The air fi ltration and optional UV light for air disinfection removes odours, mould and bacteria from the home.
T
he property in Worcestershire is an 85 square metre, 1980 standard build detached home with equal fl oor space on each level, owner by customer Joe Roberts.
There are two double bedrooms, a single bedroom and a bathroom upstairs. At ground level there is a hallway, kitchen and a large dining/living area which takes up the majority of the space. The home already featured double glazed windows, a loft space fi tted with 200mm loft insulation and cavity wall insulation.
The fact that good insulation in place from the outset was important, enabling accurate heat loss surveys and meticulous system sizing to be carried out with a thorough understanding of exactly how heat would transfer through the accommodation. The customer has expertise in renewable technologies in his
professional capacity at UNICO’s offi cial partners Bell Plumbing Supplies, and with the ability to install the new system himself, Joe selected the units himself. He chose a Worcester Bosch Air Source Heat Pump (ASHP) with weather compensation that for added effi ciency, adjusts its performance automatically based on external weather conditions. Alongside this Joe chose the Unico Heating, Ventilation & Cooling (HVAC) system, which he knew would integrate perfectly with the heat pump and was ideal for retrofi tting into a home of this type and age. With a 4.5 kW house heating and cooling load, the compact 1218 Series Unico Air Handling Unit with a chilled water coil was specifi ed and installed out of the way in the loft space. The fully insulated and sound-attenuated ducting delivers conditioned air via multiple branches to room outlets on the two fl oors. It was conveniently routed above ceilings and inside cavity walls with its small diameter and fl exibility making it simple to install. A total, of 13 round ceiling mounted room outlets were set up throughout both levels of the property.
Energy saving
Running the Unico HVAC system in conjunction with the ASHP has enabled the creation of a truly energy effi cient heating and air conditioning system. The Unico System maintains a comfortable 18ºC temperature throughout the whole house.
24 April 2025 •
www.acr-news.com
Joe commented: “Energy saving comes from the effi ciency of the Air Source Heat Pump and the overall design of the installation which is running at an effi ciency of 350%.” For additional economy, a Mixergy intelligent hot water cylinder has also been installed. Located in the loft alongside the Unico Air Handler, this provided the happy bonus of allowing an existing airing cupboard to be used for a new shower, extending the existing bathroom.
Minimal impact to interiors With no need to pull up fl oorboards to get rid of old heating
system pipework, the installation caused minimal disruption. Furthermore, the 13 ceiling outlets are fi nished in white, integrating naturally with the newly decorated rooms and totally discreet in appearance.
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