One twisted thing about cooling and climate change: It’s all a vicious cycle. As temperatures rise, the need for cooling technologies increases. In turn, more fossil-fuel power plants are firing up to meet that demand, turning up the temperature of the planet in the process.
“Cooling degree days” are one measure of the need for additional cooling. Basically, you take a preset baseline temperature and figure out how much the temperature exceeds it. Say the baseline (above which you’d likely need to flip on a cooling device) is 21 °C (70 °F). If the average temperature for a day is 26 °C, that’s five cooling degree days on a single day. Repeat that every day for a month, and you wind up with 150 cooling degree days.
I don’t know if you’ve already heard of them or if they’re even available where you live, but if it’s the cold air that bugs you, there are water-cooled ceiling plates that work just as well as a conventional A/C. An office I used to work at had them and they were lovely. They cost quite a bit more though.
As an alternative if you just want to avoid feeding surplus energy into the grid, what about a battery of 5-20kWh? It could store more energy than the A/C uses during the day, probably costs about the same or less, and you can use that energy at night.
The thing that bothers me most about office AC, is that the air is stale due to poor maintenance. Yes there are regulations against this, but those are not being enforced because that would cost money and hurr-durr stockholders and hurr-durr employers. Home ACs are just wasteful. I live in a neighbourhood that has many many gardens that are fully paved over. In order to counter the heat, each house has several AC units. Dumb fucks.
I installed solar panels 5 years ago. Back then, a home battery was ~€9000 , so not worth it. Currently, a home battery starts at ~€1500 but with pitifully low capacity. There’s currently no real incentive to install these. You may save a bit of money, but at its current rate you would look at a 15 year ROI.
Switching to an EV would be a nice idea for surplus energy, but our anti-environment government has made it very unattractive to buy one, but now I am going off-topic so I’ll save that for another rant.
I don’t know, ours eats 400-500W to cool the entire ground floor, which is a fraction of what the solar panels produce on a sunny day, and a fraction of the surplus energy we have no choice but to sell the utility company for a pittance.
In spring and autumn it can also heat the inside and has a COP of between 4 and 5 then, so much more efficient than a regular electric heater and probably more environmentally friendly than if the central heating would burn more oil - the circulation pump alone uses close to 400W.
Of course we could live without it (people have lived in the house without an A/C before), but it’s much more agreeable like this, not to mention that it allows us to use the winter garden as an office in summer, which has a great view over the garden and allows us to keep an eye on the dogs. There are many much less sensible ways to use that energy than the A/C.
Back to the battery, some EVs can be used as battery storage (vehicle to house, vehicle to grid or vehicle to load). Maybe one of those would make it more viable to have both an EV and storage space for your harvested sun? Not mavy EVs can do it at present, but it may pay to keep an eye on new models.