heating_system_efficiency.Rdefficiency of heating system technology as a function of installation time.
there was a sharp improvement in oil and gas tech with the introduction of condensing boilers
A modest post-2020 improvement in heat pump SCOP is allowed for
heating_system_efficiency(tech, install_time)
heating_system_efficiency("heat_pump",2040)
#> [1] 3.2375
heating_system_efficiency(c("oil","gas"),2023)
#> [1] 0.9 NA