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French doors can seal better, so a good quality, well-insulated French door will be more energy efficient than the best insulated sliding door. That’s because there’s no way to totally seal a sliding door and still allow it to slide past the jamb effectively.

Plenty of building codes dictate what you must install in your home, but door sweeps are optional. However, they're a low-cost addition with many advantages. So, installing a sweep on all your exterior doors is in your best interest. You'll save money in the long run and stay more comfortable year-round.

A slab door is a standalone door without a frame or hardware. A prehung door is a complete set that includes the door, frame, hinges, and sometimes the doorknob and lockset.

In most cases, a prehung door is the better and easier option to install, especially for DIY projects or exterior applications, as they often come pre-weatherproofed. They require fewer tools and less experience to install properly. Although prehung doors are heavier and have a higher upfront cost, the investment is often worthwhile for a complete upgrade that includes a new frame.

A slab door may be a better choice if you are on a tight budget, have a custom-sized wall opening, or only need to replace the door while keeping the existing frame. While the initial cost is lower, you will need to purchase all the hardware separately and do more DIY work to hang it, which may not result in significant time or money savings.

Yes, door sills are necessary components for most doorways. They serve several crucial functions, including weatherproofing, structural support, and aesthetic enhancement. Without a door sill, you risk water infiltration, drafts, and potential damage to the door and surrounding structure. Therefore, while they may seem small and often overlooked, door sills play a significant role in maintaining the integrity and functionality of a building's entryways.