This year in consistently scorching temperatures, we suddenly had Ant Hell. We've had the odd influx before, not in the house and easily controlled with one or more of those small bait tins. This year I walked into the Kitchen one evening and half the floor was alive with them. I decided to wait until morning, after killing loads. Kitchen empty and then later, many more ants.
Inspected outside where there were many ants nests poking through our gravel path. No sign of obvious route into house or kitchen. Kitchen floor actually scrubbed and disinfected. No worries, ants just arrived en masse, often mornings and evenings, didn't appear to do much except run around. A huge selection of tiny ants, loads of flying ants, and large ants carrying stuff! All sorts!
I read that you shouldn't squash them, this releases a pheromone signalling alerts to others which arrive to investigate or removed the bodies! Saw this to be true! Resorted to creeping up on crowds of them with vacuum cleaner. This worked better.
Tried painting lines of lavender oil which they will not cross - thus re-directing them along some sort of ant autoroutes. Interesting, but didn't reduce the numbers. Decided, as they were never near food cupboards that we would just try to ignore them. Food preparation could be difficult with having to vacuum worktops first, but we coped. We mostly had to ignore them.
After a month we had a day of rain. Insects and animals often appear inside if facing a deluge of water. But in this case, and when the sun returned after 24 hours, we had a whole day without ants. It seemed to good to be true. We haven't had any rain for about 3 weeks and none forecast for a further fortnight - and yesterday it was 35 degrees at 7pm. But, no more ants.
They've just disappeared as mysteriously as they arrived.
It helped me to feel that they weren't dirty and not after food, nor did they make me feel threatened as do mosquitoes or wasps, but do hope that this year was simply a One-Off.