Adding a sky glass to an account

[Dan+musical+man]

I am already a sky glass customer, I have the sky package too. I have my sky glass in my bedroom and an old TV downstairs. I would like to add the new 63 inch sky air to my account at the great price of £13 a month. Do I also need to pay the extra £15 a month for the subscription or can I just add it to what I already have?

essentially do I have to pay an extra £28 a month or just the extra £13 a month??

[SKY1992bf]

@Dan+musical+man  If you only currently have the one device then you first need to add whole home monthly subscription your account which gives you the same tv service on upto 3 glass TVs and 6 pucks then add the £13 pm on top