we use our (heatpump) drier all year round for towels and bedding... i wish we didnt have to but both me and esp our little one suffers from awful allergies.
normal clothes we use a normal clothes maiden for in this weather and dry inside. i do miss line dried clothes but the difference between in and out dryed beddings and towels is obvious when it comes to allergies. i can dose up with medication which helps, but my lad not so much.
in winter we have a 300w heated clothes maiden which i think anyone with space should consider. costs loads less than a tumble drier, its silent, and also that 300w can give out some warmth as well into the room it is in (but its not big enough for towels and bedding).
not to mention the amount of bird crap we get on drying clothes thanks to our neighbours feeding them (at least the 3 dovecotes have gone now!!!)
i did feel incredibly guilty, but less so now i have solar. not everyone can afford it or even have the right set up for it, but those who can, and do then it is worth considering.