The temperature to which you are referring is called the glass transformation temperature. This is the temperature range at which glass changes from exhibiting solid characteristics to exhibiting liquid characteristics.
It looks like HughesNet is trying their best to keep pace with new competition from Verizon's fixed LTE service Home Fusion, which offers users service in $60 (10 GB cap), $90 (20 GB cap) and $120 (30 GB plan) flavors.
A few things about Hughesnet that you need to understand... The $55 is the price for the connection, taxes and fees are not included, nor is the modem lease fee. Buying your own equipment is generally not a good idea, it costs a fortune, and if it ever fails, your out even more money. You are better paying the $10 monthly lease fee.