Energy Saving Case Study 11
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House Age: Post War (1940 - 1970)
Energy Saving Improvement 1
Type: Loft Insulation
Contractor: DIY (householder installed measure)
Description: 200mm of foil wrapped glass fibre loft insulation laid between and over joists. The floored area is raised on cross beams to accommodate the thickness of insulation.
Cost: £200 (2001)
Energy Saving Improvement 2
Contractor: Sterland and Elgar
Description: Viessmann Vitodens 300 gas fired condensing regular boiler installed in the loft heating a radiator circuit and hot water cylinder
Cost: £5,050 (2005)
Energy Saving Improvement 3
Contractor: Diamond Seal Ltd (Bradford)
Description: Triple glazed replacement windows
Cost: £2,600 (1994)
Energy Saving Improvement 4
Energy Saving Improvements Details
The property is a detached bungalow dating from 1960 with a rear extension constructed in 1987. It's in a rural location, has brick cavity walls and a pitched roof with the ground floor being mainly suspended timber.
The present owners have carried out a wide range of energy saving improvements and when originally built the house would have achieved an energy efficiency rating of SAP29 and been responsible for 12 tonnes of carbon dioxide annually.
The most cost effective improvements of loft and cavity wall insulation were carried out first, saving over 30% of the annual energy costs and reducing carbon emissions by nearly 4 tonnes. The windows were replaced by triple glazing with double glazed patio doors fitted with secondary glazing as well.
The open fireplace was replaced by an enclosed wood burning room heater and the gas central heating boiler was replaced with a high efficiency condensing boiler. This is controlled using a sophisticated optimum start energy management system and the radiators fitted with thermostatic valves. All of these improvements will have achieved a 60% reduction in energy consumption and a 65% reduction in carbon emissions.
The latest additions include solar water heating and 2 photovoltaic arrays providing around 3kWp of electricity generation.
With all the improvements the bungalow now achieves an energy efficiency rating of SAP79 with carbon emissions down a massive 80% to just 2.5 tonnes and energy consumption down by 74%.