There's nothing wrong with staying in the house all day if you want too or need too as long as you get outside at least a few times per week.
There's times when it's too hot to be outside or too cold to be outside at least for too long so some days if I do not have to go to work and it's either too hot or too cold outside then I can sometimes stay inside the house all weekend.
I do try to get outside as much as possible though even during summer and winter to get some fresh air and sunshine because going without sunshine and fresh air for too long is bad for your health.
You need sun to provide you with vitamins so that you boost your immune system and prevent getting viruses such as the cold and flu.
The air inside the house is also pretty polluted even more so than outside air so it's good to get outside some to get fresh air as your health will improve.