gravity heating return system 重力回水系统
gravity heating return of condensate 冷凝水重力回水
open return steam heating system 直接蒸汽供热系统
vacuum return-line heating system 真空采暖系统
mid return steam heating system 中回式蒸汽供暖系统
Over the life of a new furnace, the big dollar savings will be in your heating bill, not your tax return--particularly if you live in a cold climate.
FORBES: Energy Tax Breaks: About To Expire
The return is the annual rental value, minus operating costs like property taxes, heating bills, lawn care and insurance.
FORBES: I, Landlord
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