Before solar you need to do consumption reduction. Hire a home energy auditor to come and evaluate your house. They should do a blower door test as well as thermal imaging to find where your air leaks are etc... As well as recommend any insulation upgrades you may need. Air leakage and your behavior are the leading drivers of energy consumption. After that reducing demand by technological means (insulation, light bulbs more efficient appliances) allows those savings to go even further.
Your location says you are in India, so I have absolutely no idea who to contact over there. My first thought is to hunt down someone with a Ph.D. in HVAC (refrigeration engineering) and see if they know someone who does residential work.
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