Humphry you can use a special transformer called a SOLA voltage regulating transformer. Internal buck/boost winding regulates the output voltage to <1% variation over a large input voltage range. Available from a local electrical supply house or industrial electronics vendors such as Allied Electronics, Newark, etc.
Size the unit according to the current of your load; I suspect the smalllest model will work. Order the model for 120Vac in to 24Vac out of course.
Size the unit according to the current of your load; I suspect the smalllest model will work. Order the model for 120Vac in to 24Vac out of course.