135% is quite low for an air source heat pump. For instance a Samsung HHSM-G600005-1 [0] claims to have been tested to be 485% efficient at heating water to 35°C and 283% efficient at heating water to 55°C, both with 7°C air temperature. For Finland you'd want to find a heat pump with a datasheet specifying SCOP for specifically the EN 14825 Northern Europe climate zone. I couldn't find one with some quick googling, but I found a Swedish site selling a air-to-air heat pump[1] claiming 222% efficiency at -25 °C.

0: The Cop numbers in this product spec: https://www.snhtradecentre.co.uk/wp-content/uploads/2024/02/...

1: https://varmepumpshopen.se/luftvarmepump/panasonic-hz25zke