"OG" wrote in message
...
OG wrote:
ransley wrote:
On Mar 9, 3:42 pm, "OG" wrote:
We've just had our first gas bill (for heating and cooking) since the
cavity
wall insulation was installed mid-December.

Last winter (Nov 07- Mar 08) - average daily usage 10 units per day
This winter (Dec 08 - Mar 09) - average daily usage 7 units per day !

I didn't expect it would make that much difference, and I'd say that
this
has probably been a colder winter than last year.

I reckon that means we should pay back the (70% subsidised) cost in
about 15
months.

How did temperature days units compare, a bill is meaningless without
knowing temp heating days. So i say it was warmer this year.

Oh good, if you've got (Dec, Jan, Feb) temperature stats for (07-08) and
(08-09) for Liverpool I'd be really interested to see them.

Thanks for the head up - I've not come across temp heating days before,
but I found a definition on Wikipedia and the monthly stats for Liverpool
on Weather Underground

Weather Heating days (monthly Sums base 65)
Dec 07: 661, Dec 08: 744
Jan 08: 622, Jan 09: 805
Feb 08: 649, Feb 08: 676

Average Mean daily Temperatures
Dec 07: 5C, Dec 08: 4C
Jan 08: 7C, Jan 09: 3C
Feb 08: 5C, Feb 08: 4C

So it looks to this novice like it /has/ been colder this year.

Coldest winter for 13 years.

http://news.bbc.co.uk/1/hi/uk/7921230.stm

My cavity wall insulation has paid for itself in less than12 months. My
quick payback time is due to the low price I paid for the installation, the
way my house is constructed (not normal bricks), having a gable end that is
exposed to the Pennines and the price increases of gas.

Cavity wall insulation usually take 2 to 4 years payback time.

Adam