Dear Sir,
Service tax has to be charged on 50% of the invoice value if the service provider is an individual, HUF or partnership firm and service receiver is a body corporate. I assume that supplier of AC has also installed the same and raised a combined invoice, and thus transaction becomes a works contracts as defined under 65B (52). If this is the situation, Service provider has rightly charged service tax on 50% of invoice value (this is the portion of tax which service provider is supposed to pay to the central government and est 50% shall be paid by service receiver). Rest 50% shall be paid by you. (read your company).
It may be noted that even in case of works contracts, what is taxable under Finance Act, 1994 is the service portion in execution of works contract. i would say, technically (it may sound hyper technical) it incorrect to say "works contract service". works contract is neither goods nor service. it is hybrid of both and distinct from both. Its altogether separate class in itself. For service tax purposes what is relevant is the "service portion in execution of works contract" and not works contract as a whole.
if two separate bills has been raised, one fore supply of AC and other for installation of AC, here two distinct transaction are happening. one is of sale of goods and other is rendering of service. Service tax can never be levied on a transaction of sale of goods, as being a subject of tax to be levied and collected by state government under 7th Schedule List II of Constitution. Now as the installation services are pure services, company need not to pay tax under reverse charge. In this scenario service provider would be charging tax on 100% of invoice value.
Coming to the issue of availability of credit, it may be noted that for manufacturer, primarily, credit is available of any services used whether directly or indirectly, in or in relation to the manufacture of final products and clearance of final products up-to the place of removal subject to certain exceptions.
Service portion in execution of works contract has been excluded from definition of "input service"
in so far as they are used for -
(a) construction or execution of works contract of a building or a civil structure or a part thereof; or
(b) laying of foundation or making of structures for support of capital goods, except for the provision of one or more of the specified services; or
It is very clear from above that your case is not falling under exclusion.
Credit will be available to you, subject to the condition that your company would qualify as manufacturer or producer.