could anyone knows about any website having good information about hvac?
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http://www.ashrae.org/\nhttp://www.allhvacinfo.com/technical_magazines.asp\nhttp://www.epa.gov/ozone/title6/608/608fact.html\nhttp://www.qwik.com/\nThe last link tells how to get licenses to work with refrigerants legally.
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As far as:\ncost\nsafety\nreliability\nmaintenance\n?\nregarding:\nappliances\nheating\nrefrigeration\n?\n\nGenerally, surprisingly enough, people in your area have this pretty well figured out for the region. <They just copy good engineers work> If you are spending money, call six contractors and ask for an informal demographic profile of the area. Ask them what you should do.\n\nhttp://www.google.com/search?q=gas+vs+electric
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www.learnthat.com or www.gethomeworkhelp.com
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go look at the link I provided.  it has lots of good info.
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Hoovers is really good. I used it a lot a few months ago. It gives you lots of info in a nice format. Here's a link:\nhttp://www.hoovers.com/free/?cm_ven=PAID&cm_cat=OVR&cm_pla=HOL&cm_ite=hoovers
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A good site to get data is :\nhttp://www.cleanairworld.org/
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I know one website it is  howstuffworks.com  where you can get almost all information related science, engineering, & technology too. There are thausands of sites related to science while searching through Google you can get some more also.
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USA Today\nhttp://www.usatoday.com/weather/resources/askjack/wfaqpast.htm\n\nUSA Today Online weather almanac\nhttp://www.usatoday.com/weather/waverage.htm\n\nCurrent Contiguous United States Analysis of Temperature\nhttp://www.coolwx.com/analysis/\n\nUnited States Historical Climatology Network (USHCN)\nhttp://www.ncdc.noaa.gov/oa/climate/research/ushcn/ushcn.html
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I know of two products:\nElectronic Service Control (has a free 30 day trial + an online trial) - trialhttp://www.coastalcomputercorporation.com/index.html?engine=Google&term=hvac_software&GTSE=GOOG&GTKW=hvac+software \nShafer's - http://www.shafers.com/hvac_software/?wt.srch=1\n\nFree Software is hard to come by, maybe you could try a P2P Network - http://www.shareaza.com/
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If you are looking for forecasts go with http://www.weather.com\nFor info on lightning: http://www.insuremyhouse.com/lightning.html\nFor info on tornadoes: http://www.insuremyhouse.com/tornado.html\n\nFor more try running a search on http://www.kahmer.com
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I would go here: http://www.insuremyhouse.com\nCheck out their Learn the Basics section.
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If you want some info look at this magazine call mother earth news it has alot of info on solar energy, solar heating and other stuff. Try it, i'll give the webs site of were to get it. I am always look at solar earth and cheap heating. i hope this helps http://www.motherearthnews.com/
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alot of the areas are with the main distributers and equipment retailers.  you can go to any of the equipment web sites and they have tons of info you can get.
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www.marineengineering.org.uk\nwww.marinediesels.org.uk
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Check out: http://www.martinlutherking.org/ \n\nOnly if you're ready for some REAL information...
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I recommend the following website for insulation choices.
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You can find a lot of info in \nwww.automatedbuildings.com and also \nhttp://www.ddc-online.org/\n\nThanks,\nRay Kamal\nVP\nComputrols, Inc\nwww.computrols.com\nBuilding Automation Made Simple