abstract
allay
allowance
background
blue
close
cold
concept
consumption
control
copy
cost
crisis
crude
device
economy
electricity
energy
environment
expense
expensive
finance
freeze
frost
gas
heat
heating
home
house
increase
inflation
isolated
live
money
oil
power
raise
regulation
rent
saving
season
slope
small
space
supply
symbol
tax
temperature
thermostat
thrifty
up
winter