If you don't want to splurge on any new modern curtain ideas, HVAC expert Kaspar suggests insulated liners, instead. He says, ...

these can be very simple with straight lines for modern curtain ideas, even finished in timber and not fabric, or perhaps try an unusual, geometric shape and play with the lines of it.' ...

Explore living room curtain ideas ranging from semi-sheers to blackout ... If you're drawn to modern furniture, hard edges, and sculptural pieces, utilize drapery to help soften the edges.