The standard 60cm oven has been joined by various other sizes. Now consumers can choose from 60,70 and 90cm wide built-in single ovens. Always check the internal capacity shown in litres as well as the external dimensions.

Ease of cleaning is well worth considering at the outset. Stay clean liners resist dirt build-up but pyrolitic cleaning is the ultimate. It burns off all baked-on debris at 500°C so that all you have to do is sweep out the resulting ash. Look out for ovens with a steam cleaning facility, too, and remember that some ovens have removable inner doors that are easy to clean.

You can also maximize the efficiency of appliances you already own through regular maintenance and tune-ups and system upgrades. Examples of some things that you can do are:

• Check air filters in heating and cooling systems monthly during the seasons they are in use and clean and replace them as necessary.
• Clean air vents, baseboards, and radiators regularly and keep them unrestricted by furniture, carpets, or drapes.
• Release trapped air from hot water radiators once or twice a season by opening the valve until nothing but water comes out.
• Follow prescribed maintenance (e.g., maintaining certain water levels in steam heat systems).
• Install an insulating jacket on your hot water heater, insulate hot water pipes, and lower the water heater temperature.
• Clean refrigerator coils yearly and maintain internal temperatures between 36 degrees F (2.2 degrees C) and 38 degrees F (33 degrees C) for the refrigerator compartment and between 0 degrees F (17.8 degrees C) and 5 degrees F (15.0 degrees C) for the freezer compartment.
• Move the refrigerator if it is currently located near the stove or dishwasher.
• Regularly defrost refrigerators that do not have a completely automatic defrost capability to eliminate ice build-up on interior coils.
• Clean dryer filters after each use or as necessary.