i live in a mobile home,wondering if the solar screens really help with keeping heat out,and lower electric bill?

when i bought my house the inspector noticed that it had solar screens and made a comment like they help to reduce the heat in the house as well keep out some if the glare.but in a trailer house I’m not sure the cost of installing them would pay off very fast.maybe the combo of solar screens and blinds may help over the long haul if you plan on staying there for 10 to 15 yrs.