Do you love enjoying gorgeous scenic views and landscapes throughout the year from the vicinity of your room. 4 and 3 Season rooms provide a good lounging space for you and your home mates to enjoy quality time without fretting about the extremities of the weather.  An excellent way to relish the natural scenes and sights is through your seasonal sunrooms. A brand new seasonal sunroom might be a perfect choice for you and your family. 

While designing your new sunroom, it’s essential to pick between a 3 season and a 4 season sunroom. However, before making the final choice, it is important to learn the key differences between the two sunrooms. It’s also necessary to learn what is suitable for your lifestyle and fits your budget. So without any delay, let’s get started. 

What you’ll learn in this article:

What is a 3 season room?

3 season sunroom is enclosed with glass and may feature windows from the floor to the ceiling. The windows have protection from the UV rays so you can enjoy these rooms most times of the year. It can prove ideal in springtime, fall, and summers. However, since these rooms are not efficiently insulated, you cannot use them during harsh and cold weather. Families who do not desire to spend their quality time in the living spaces during winters can opt-out for a 3 season room.

When you opt-out for a 3 season room, there are various other benefits that you can enjoy, which include:


One of the best things about a 3 season room is, it is an affordable and cost-friendly option for designing your living spaces. 


The 3 season room keeps you safe from pollen irritants, pests, and UV radiations. So you can enjoy your time with your families without worrying about these things. 

Less intruding:

While installation of 3 season sunroom, there’s lesser site preparation required. The construction of the room doesn’t intrude or disturb your day-to-day activities. 

What is a 4 season room?

If you adore enjoying the weather regardless of the weather conditions, then 4 season rooms are a perfect solution for you. You can enjoy these rooms throughout the year. Because the rooms feature thermally engineered roofs and frames, they can be heated and cooled throughout the year. Therefore, it can serve as a real extension for your home. 

Consequently, you can enjoy added these benefits in a 4 season sunroom:

Perfect for the whole year:

Due to its thermal insulation system in the roofs, flooring, and walls, you can use 4 season rooms at any time of the year. 

Access to natural light:

It also has glass windows which give you access to unlimited natural light throughout the summers. 

Planning unexpected events:

In case of harsh weather, you can still host events at your home and manage your guests in your 4 season rooms


Although the installation costs of the 4 season rooms are high, in the long term, 4 season rooms prove more effective. In addition, it’s a good investment since you use the room throughout the year.

Screened porch - alternate view of the finished by Modern Architectural Glazing
4 season room and deck with three quarter windows

Key Differences between a 3 season and a 4 season room:

Layout and design features:

While designing a 3 season room, the heating and the AC of the room should connect with the main HVAC system of the house. However, as far as the 3 season room is concerned, it has a separate HVAC system.  

Installation costs:

The installation costs of a 4 season room are higher than a 3 season room. It’s expensive because the 4 season room construction design needs to be efficiently heated and cooled. 

Seasons of use:

As discussed above, 3 season rooms are in use by homeowners for the majority of the year. The exception is for winters when the temperature drops too low. At the same time, the 4 season room is open to anyone all around the year. 

Doors and Window Systems:

Both the 3 season rooms and 4 season rooms offer large doors and windows; however, the difference is in the glass installation. The 3 season room usually installs a single pane glass. On the other hand, the 4 season room utilizes a dual glass that is insulated.


The framing material of both rooms differ. The4 season rooms have thermally engineered framed windows and doors. This aspect helps in efficiently maintaining the temperature of your space. However, the 3 season rooms do not install thermally engineered frames. That’s why it costs less. 

Seasonal room screen repair:

The seasonal rooms have lanai porches. These lanai porches are made up of large screened areas. As a result, there are high chances of rips and rots. You might need a screen repair service to fix your screens. 

The seasonal room screen repair depends on the type of screen and frame installed. The types are divided into three main types, which include:

  • Vinyl
  • Aluminum
  • Wood

The Vinyl and Aluminum framed screens are relatively easier to repair. They require less maintenance. The screen is held by a small channel that is built by an Aluminum or a Vinyl frame. 

As far as the wood frames are concerned, it gives a beautiful look. However, it requires a great deal of maintenance. Various issues can occur in a wood frame that includes rotting, nail rusting, fastener loosening, stains, and repainting. 

To get your screens repaired, it’s essential to opt for a cost-friendly screen repair plan from a trusted vendor. Repairing the screen by yourself might result in technical faults. Thus, it is not recommended to undertake the screen repairing process all by yourself. It would be best if you looked for a reliable and time-savvy screen repairing service. In this way, you can avail of the services in a lesser time without getting into any technical troubles. 

Key Takeaways & Next Steps

A seasonal sunroom can be a beautiful addition to your new homes or a perfect extension of living space for your families. We hope you might have analyzed the key differences between a 3 season room and a 4 season room and chosen the best suited to your lifestyle. 

It is also important to ensure that you have a screen repairing service ready to help whatever seasonal room you choose. To stay on the safe side, choose a trusted vendor and a good service plan for your screen to have a smooth experience in your rooms. 

Modern Architectural Glazing has been designing and developing Curtain Wall Systems for some of the leading businesses in the area for years. We have the knowledge and expertise to craft your project to your desired specifications. Click below to learn more about everything we have to offer. Or you can follow us on Instagram to see highlights of our latest projects!


Seasonal Rooms