I’ve been looking at that decision. My furnace is well beyond its expected life and I’d like to replace it before it dies so it’s not an emergency. I’ve looked at heat pumps and really want to make that choice. The incentives help with the initial cost, at least for a couple more months.
But then it comes down to gas is cheaper than electricity. If electricity is twice the cost per unit of energy, is it really sufficient for the heat pump to be twice as efficient? How can I rationalize the choice that is not only more expensive to install but more expensive to run?
And the answer is not sinking yet more money into also doing solar. My house is mostly shaded, and I’m not killing treees just to make this mess work together
muntedcrocodile@hilariouschaos.com 4 weeks ago
Well the whole point of a heat pump is that they have a COP (coefficient of performance) of about 2-4. Meaning that for every unit of energy u put in they have an effective heating/cooling capacity of 2-4 units of energy. They have an effective efficient of greater than 100% whereas a gas can only every reach a max of 100%.
AA5B@lemmy.world 4 weeks ago
At ideal conditions. As the temperature difference is greater, the efficiency goes down. So right when you need heat the most, gas is still at 90+% efficiency while heat pumps are closer to or under 200%.
Then you have to look at capacity. It can be expensive sizing for the greater temp differences when it usually isn’t. If you have a heat pump that can be 400% efficient, do you really want to pay for quadruple the capacity so that even when it’s at 100% efficiency it still puts out enough heat? No one can afford that