15 3.2
WINDOWS AND DOORS
COMMENTS AND OBSERVATIONS
Most of the windows in the property are double glazed windows with moderate efficiency in good condition. Although minor savings would result from replacing them with more modern units, this saving would be very small indeed compared with the cost of replacement.
thermal comfort by reducing radiation losses from people ± that chill you get when next to a window.
MEASURES EVALUATED
Two of the windows in the property are single glazed windows in reasonable condition. Although these are inefficient, they do not have a large area compared with other elements such as walls or roof, so are probably losing comparatively little energy compared with the cost of replacement. For this reason they are not necessarily cost effective to replace compared with other cheaper and more effective measures possible at the property. The front door is solid wood, while the kitchen door is a wooden stable style door. The utility door is double glazed. DISCUSSION OF OPTIONS
Although replacement or refurbishment of windows might allow other benefits beyond energy savings such as avoidance of condensation and improved security, windows are generally expensive to improve, and generate relatively modest benefits. ENERGY PROPORTIONS*
7.8% of energy bills - £167 CO2 EMISSIONS PROPORTIONS*
5.7% of the CO2 emissions - 390 kg *These are for conduction losses only. Losses due to window and door draughts are included in the next section µDraughts¶
If substantial upgrades are being planned to most of the other building fabric elements i.e. the walls, then it will probably be necessary to improve the windows to reduce condensation. In addition, improving the controlled ventilation may also be necessary. The reason being is that upgraded walls will have less water condensing on them (usually in small enough amount to not be noticed) and so the condensing of the water in the air is concentrated on the remaining cold surfaces i.e. The windows. Well fitting thick curtains can reduce the losses through windows by 10%. They can also increase
SAMPLE REPORT