Hi, I built a 4 bedroom detached house in 2014. The council said I could only have ground or air source. I couldn't afford ground, so a 14kw samsung air souce was put in through a compy called joules. It works very well. I was happy with the system. The trouble is back then electric was 12p kwh. Now it's 28, going upto 42 in October. My bills are massive. I'm useing around 15000kw. I got a qoute to fix electric, came in at £8000. I'm seriously thinking of ripping it out and putting lpg gas in! 1 liter of gas is equivalent to 7kw. Say gas at 50p a liter that's 7p kwh. £5000 to install gas? Anybody got a better idea?