A B&B, located in a steep-sided valley in central Scotland, no south facing windows and very little solar gain. Main house and attached cottage, 8 bedrooms, 2 kitchens, 2 sitting rooms, 6 bathrooms and a conservatory. Solid stone walls with good outer blocks but rubble in-fill. Dormers built into roof space of much of house and therefore little scope for loft insulation.
We and our long-term guest in the main house are in all day most of the winter.
a) When radiators first fitted to entire house in 2004, 10,500 litres!
Allowing for the unusual cold over the last 12 months , without remedial measures, we estimate this would have been 12,000 litres and we still would have been cold.
b) Consumption over last 12 months: around 6000 litres
Note that the cottage has doubled in size and is heated far more effectively than in 2004 so the reduction in oil consumption for a like-for-like comparison would probably be nearer to 60% than 50%.
Temperature inside the house and cottage in particular plummets over night from 21C at 10pm to 15C at 6pm with an outside temperature of 3C.
This is despite the cottage being modernised to conform to Building Control regulations, having masses of loft insulation and Kingspan on interior all outside walls.
Measures already taken
* High-efficiency condensing boiler installed
* House divided into several heating zones each with separate programmer
* All radiators fitted with TRVs
* Full double glazed
* All accessible loft space well insulated
* Specialised heat recovery extractor fan installed in kitchen
* External walls of cottage, 2 bedrooms and office all lined with Kingspan
* Large cracks on one external wall filled with lime mortar
* All external doors and windows draught proofed
* Tree and large shrub to south-east removed to give allow more sun-light to reach house
a) We've been waiting months for a plumber to install an optimiser for our boiler which will monitor internal and external temperatures, the temperature of the return flow etc in order to maximise the time the boiler is in condensing mode and optimise the temperature to which the water is heated.
b) Considering external insulation to side and rear of property. Will not compromise the appearance of the front of the property and the gable ends and would not be allowed to since we're in a National Park.
c) Wood-burning stove. Whenever I have considered it, I've concluded that spending the capital on WELL-TARGETED insulation is better for the environment, involves less work, operates 365 days, 24 by 7 and yields a far better return on investment.
Does anyone know how we can get any help, advice etc ? (No double glazing, cavity wall insulation or loft insulation sales people need apply! Ground
heat pump probably impractical because of rocky substrata and we need much more than background heat!)