To darken your windows without curtains, try installing window film or even installing an awning outside your windows. Window film is a DIY-friendly option with many different darkness levels you can choose from to fit your desired look. Awnings can also help by casting shade over your window, though this isn’t feasible for every home. 

Upgrade to double-glazed glass or apply energy-efficient coatings to reduce heat loss and utility costs.

The most popular tint percentage for home windows is 35%. Generally, most homeowners choose a visible light transmission (VLT) between 50% and 35%, where lower numbers mean less sunlight enters the home. A 35% tint blocks over half the incoming light while still allowing plenty of natural light, which can improve energy efficiency and comfort. If privacy is a primary concern, you can opt for a tint of 50% or lower to make it more difficult for people to see inside. However, keep in mind that very dark, thick tints may offer fewer energy-efficiency benefits.

Unlike cars, there are no laws regulating window tint percentages on homes, so you can choose what you think is best. It is often a good idea to hire a professional, as they can show you samples of how different tint levels will look in your specific property, helping you make the right choice.

Home window tinting is generally considered a worthwhile investment due to its numerous benefits. The primary advantages include:

• Energy Efficiency: Tinting reduces solar heat gain, which lowers cooling costs in warmer months. It can also help retain heat during cooler months, leading to savings on your electric bill that may eventually exceed the initial cost of the tinting.

• UV Protection: It blocks harmful UV rays, protecting your family and pets from sun damage. This also prevents fading and extends the life of your furniture, flooring, and other interior furnishings.

• Increased Comfort: By regulating heat, window tinting helps maintain a more comfortable and even temperature throughout your home. It also reduces glare on TVs and other electronic screens.

• Enhanced Privacy and Security: Tinting makes it more difficult for outsiders to see into your home. Additionally, certain types of window films can increase security by helping the glass withstand trauma from break-in attempts or severe weather.

It's important to note that not all window tints offer the same combination of benefits. For example, security films are designed for impact resistance but may offer less UV protection, while ceramic tints excel at blocking heat and UV rays but do not provide the same level of security.