adult
appliance
bank
bill
central
charge
cheap
coin
cold
consumption
control
crisis
degree
efficiency
electric
electrical
electricity
energy
expensive
finance
finger
gas
hand
heat
heater
heating
holding
home
house
increase
inserting
knob
money
people
person
piggy
piggybank
pink
power
radiator
reduce
rise
save
saving
technology
temperature
thermostat
valve
warm
woman