Depending on where you live, it may well be that the termites in your garden are no threat to anything.  There are lots of species that never, well mostly never, behave as pests.  In my garden a Nasutitermes and a Porotermes pose no threat to my home. I keep them as pets (and samples for teaching).  But you’re not me.  Before doing any control measure, you really should have the termites identified AND inspect your house.  This will allow you to decide what to do from a position of power.  Only when you know the extent of the problem, will you be in a good position to choose between management options.