Another option for your house is a booster/amplifier where you place an antenna outside your house up high, and another in the house. The amplifier in between relays the signal, amplifying it. This is like having a cell site in your house and while it may solve your problem, but they can be expensive, $200 to $500.
Check decibel signal level under settings/more/about phone/status. Or use the app "Network Signal Info". Decibels are shown as a negative number, with a -50db signal being stronger than a -75db signal. Set the phone near each other and compare. I suspect you'll see your husbands has the better signal. If your phone continues to lag your husbands when side by side and looking at decibels (not bars), then take it back and get a replacement.