One exception to note: If the food's sitting in an environment where the temperature is over 90Â°F, the USDA says the food should only be left out for one hour, so keep an eye on the clock if you're serving food on a hot day!
Estimated cost of hydrogen per kilogram in a variety of scenarios. With all of this in mind, here are the cost estimates per kilogram (which each include $1.25 for taxes): Hydrogen from natural gas (produced via steam reforming at fueling station). $4 â $5 per kilogram of hydrogen.
A typical force-air furnace system for a 2,000 sq. ft. home will cost you between $3,800.00-$4,500.00 versus a hydronic boiler system costing about $4,000.00-$5,000.00. The average life expectancy of a forced-air furnace may be between 10-25 years where the average boiler system can last between 30-45 years.