I'm thinking of making a tiny green house to sow seeds in in the winter
I'm gonna make a frame with a few metal arches and cover them with nylon as it's the easiest plastic I can find.

Will the nylon trap the heat like in a greenhouse? and when I want to water the seedlings I'll have to lift the mini greenhouse, will that cause the heat to escape and affect the seedlings? or is the greenhouse only necessary to be on when frost happens?

I'm in zone 10a and we might have one or two frosts only in Feb and they're always 30 - 32 degrees

Whatever you build, the top will have to swing up or be removeable for watering, maintenance and to let excess heat and moisture escape. A hinged lid is handiest as you can prop it open at any height you want.

I think you will discover the lid will be off more than its on.

DaisyI said:

Whatever you build, the top will have to swing up or be removeable for watering, maintenance and to let excess heat and moisture escape. A hinged lid is handiest as you can prop it open at any height you want.

I think you will discover the lid will be off more than its on.

That's a relief, thanks.

@Daisyl is right but as an alternative you can leave the lid unconnected and prop it up on brick or wood blocks (to allow air flow) for a small amount of protection on those days that are cold but not frosty.

Henderman said:@Daisyl is right but as an alternative you can leave the lid unconnected and prop it up on brick or wood blocks (to allow air flow) for a small amount of protection on those days that are cold but not frosty.

This is exactly what I was planning, much easier than a hinge and those other stuff.
Thanks

Laudin said:

This is exactly what I was planning, much easier than a hinge and those other stuff.
Thanks :)

But be careful on windy days!