What Is a Window in the Ceiling Called? 🌤️

If you’ve ever seen a window in the ceiling and wondered, what is a window in the ceiling called, the answer is simple: it’s a skylight. Skylights are installed on the roof or ceiling to bring in natural light, ventilation, and a sense of openness to a room.

Skylights are not just decorative—they can improve energy efficiency, add resale value, and make small spaces feel larger.

In this article, we’ll cover what skylights are, compare them to other home features like what is the AC unit in the attic called, and even explain what are the lines in concrete called—common questions homeowners often ask while upgrading or maintaining their homes.

What Is a Window in the Ceiling Called?

The proper term is skylight. These come in various designs, such as:

• Fixed Skylights – Don’t open, purely for light.

• Ventilated Skylights – Open to allow airflow.

• Tubular Skylights – Compact tubes that bring light into small spaces.

• Custom Shapes – Triangular, round, or oversized windows.

Skylights are popular in kitchens, bathrooms, and attic conversions where extra daylight is needed.

Benefits of Skylights

Installing a skylight can transform your home:

• Natural Lighting: Reduces reliance on artificial light.

• Energy Efficiency: Increases warmth in winter (but may need shading in summer).

• Aesthetic Appeal: Adds architectural interest.

• Ventilation: Helps release trapped heat or moisture.

Pro Tip: Always choose skylights with low-E glass or proper shading to avoid overheating rooms.

What Is the AC Unit in the Attic Called? ❄️

Another question many homeowners ask during renovations is: what is the AC unit in the attic called?

The answer: it’s typically an air handler or HVAC unit. In split systems, the air handler is in the attic while the condenser is outside. This setup saves space indoors but requires good insulation and drainage to prevent leaks.

What Are the Lines in Concrete Called?

While skylights brighten ceilings, homeowners often wonder about flooring details too. What are the lines in concrete called?

• They’re known as control joints or expansion joints.

• Their purpose is to prevent random cracking by allowing concrete to expand and contract naturally.

• They’re essential in driveways, patios, and garage slabs.

Those lines aren’t flaws—they’re part of a smart design to keep your concrete from cracking.

Quick Reference: Skylights vs. Related Home Features

Feature	Proper Name	Purpose
Window in ceiling	Skylight	Light & ventilation
AC unit in attic	Air Handler / HVAC Unit	Heating & cooling distribution
Lines in concrete	Control Joints	Prevent cracking

FAQ: Skylights and Home Features

What is a window in the ceiling called? A skylight, designed to bring natural light and sometimes airflow into a room.

What is the AC unit in the attic called? It’s an air handler or HVAC unit, part of your home’s heating and cooling system.

What are the lines in concrete called? They’re control joints or expansion joints, placed to prevent cracks.

Do skylights add value to a home? Yes, they boost curb appeal and natural lighting, increasing resale value.

Are skylights energy efficient? Modern skylights with low-E coatings are energy efficient, but older ones may cause heat loss.

Conclusion

So, what is a window in the ceiling called? It’s a skylight—an elegant and functional way to add natural light and style to your home. Along the way, you may also ask, what is the AC unit in the attic called (an air handler) or what are the lines in concrete called (control joints).

By understanding these features, you can make better choices when upgrading your home. Skylights, in particular, are a beautiful investment that can transform any space. ✅